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	---
	tags:
	- sentence-transformers
	- sentence-similarity
	- feature-extraction
	- generated_from_trainer
	- dataset_size:190175
	- loss:MultipleNegativesRankingLoss
	widget:
	- source_sentence: 'Congruence of Triangles. Triangles. Maths. CBSE 9. CBSE Content
	- Final. CBSE. '
	sentences:
	- 'Expressing Multiplication Sentences Practice. . '
	- 'Prove R-H-S criteria for congruence of triangle. . '
	- 'DNA. .   I''m sure many of y''all have already heard of the molecule DNA,
	and it stands for deoxyribonucleic acid. I wrote it out ahead of time to spare
	you the pain of watching me spell this in real time. But it is-- and I think you
	already have an idea. This is the basic unit of heredity, or it''s what codes
	all of our genetic information. And what I want to do in this video-- because
	I think that''s kind of common knowledge. That''s popular knowledge that, oh,
	everything that makes my hair black or my eyes blue or whatever, that''s all somehow
	encoded in our DNA. But what I want to do in this video is give you an idea of
	how something like DNA, a molecule, can actually code for what we are. How does
	the information, one, get stored in this type of a molecule, then how does that
	actually turn into the proteins that make up our enzymes and our organs and our
	brain cells and everything else that really make us us? So this is a computer
	graphics representation of DNA, and I''m sure many of y''all have heard of the
	double helix.   And that''s in reference to the structure that DNA takes.
	And you can see here it''s a double helix. As you can see here, you have two of
	these lines, and they''re intertwined with each other. You see there, that''s
	one of them, and then you see another one intertwined like that. And then they''re
	connected by-- you can almost view it as like these bridges between the two helixes,
	and they twist around each other. I think you get the idea. So the double helix
	just describes the structure, the shape that DNA takes, and it leads to all sorts
	of interesting repercussions in terms of how heredity takes place and how natural
	selection and variation might take place as well. And actually, in the future,
	I do want to actually read with you Watson and Crick''s paper on the double helix
	where they essentially talk about their discovery. The best thing about that paper,
	besides the fact that it was probably one of the biggest discoveries in the history
	of mankind, is that the paper is only a page and a half long, and it goes to my
	general view that if you have something good to say, it shouldn''t take you that
	long to say it. But with that said, let''s think a little bit about how this can
	actually generate the proteins and whatever else that make up all of us. So right
	here this is a zoomed-up version of that graphic that I just showed you a little
	bit earlier, and this is each of the helixes. So if this is the magenta side,
	if you unwound this helix-- right now it shows it in its wound state, but if I
	unwind this helix, one side would maybe be this magenta side of our helix and
	then one side is this green side, right? And if you twist it up, you get back
	to this drawing up here. And then these bridges that you see in this drawing in
	the double helix, those are these connections right here. These are the bridges.
	Now, what allows us to code information is that the blocks that make up
	the bridges are made of different molecules. And the four different molecules
	that are made up in DNA are adenine-- and it''s written here on this little chart.
	I got all of this from Wikipedia, so if you want more information I encourage
	you to go there. Adenine, that''s up here. This is the molecular structure of
	adenine. It''s connected to a sugar right here, ribose. I won''t go into a deoxyribose.
	And then you have your phosphate group. But these kind of form the backbone of
	the DNA: the sugar and the phosphate groups. And I''m not going to go into the
	microbiology of it, because that''s not important right now to understanding just
	how does this intuitively code for what we are. So along the backbone, which is
	identical, and we''ll talk about it. They run in different directions. It''s called
	antiparallel, so they label the ends. And I''m not going to go into detail there,
	but the important thing are these bases here. So you have adenine, and adenine
	pairs with thymine, and you see that up here. If you have an adenine molecule
	here, an adenine base here, it''ll pair with thymine, and this is called the base
	pair. Adenine and thymine pair with each other. If you have thymine, it''s going
	to pair with adenine. And then you have guanine and it pairs with cytosine.
	And the names of these, you should know these names, just because they are almost--
	well, if you ever enter any discussion about DNA and base pairs, this is expected
	knowledge. But the names of the molecules and how they''re structured, not important
	just yet. But what''s important is the fact that there are four of them and that
	they essentially code information. So you can view one of these strands in kind
	of a simplified way. You can just view it as a strand of-- so this one, if it
	has an adenine and then it has a cytosine, then it has a guanine. That''s a guanine.
	They did it in purple. And then it has a-- oh, no, it has a thymine, not a guanine.
	So it has a thymine in purple, and then in blue, it has a guanine. So this strand
	right here codes ACTG. And if you were to code the opposite side of the strand,
	you could immediately-- I don''t even have to look here. I can look at this side
	and say, OK, adenine will pair with thymine, cytosine pairs with guanine, thymine
	pairs with adenine, and guanine pairs with cytosine. So they''re complementary
	strands. So if you think about it, they''re really coding the same thing. If you
	have one of them, you have all of the information for the other. Now, in our DNA,
	in a human''s DNA, you might say, hey, Sal, how do I go from these little chains
	of these molecules? How does that turn into me? How does that turn into this complex
	organism? And the simple answer is, well, the human genome has three billion of
	these base pairs.   And that''s actually just in half of your chromosomes.
	And I''ll tell you, maybe in this video or a future video, why we only consider
	half of your chromosomes, and that''s because essentially you have a pair of every
	chromosome. I''ll talk in more detail about that. And this number, to some people,
	they might say, it only takes three billion base pairs to describe who I am? And
	some people would say, wow, it takes three billion base pairs to describe who
	I am. I never thought I was that complex. So depending on your point of view,
	this is either a large or small number. But when you take these three billion
	base pairs, you''re actually encoding all of the information that it takes to
	make in this case a human being. And actually it turns out a lot of primates don''t
	have that many different base pairs than human beings. The amazing thing is even
	things like roundworms and fruit flies also number in a surprisingly large fraction
	of the base pairs of a human being. Maybe I''ll do another video where I go into
	comparative biology. But how do these base pairs actually lead to proteins? I
	mean, it''s fair enough. That''s information. It''s like you can view these as
	ones and zeroes in some type of computer language, but really they''re not just
	ones and zeroes, because they can take on four different values. They can take
	on an A, a T, a C or a G, so you could think of them as zero, ones, twos and threes,
	but I won''t go into that whole aspect of it just now. So how does that actually
	code information? So DNA when it actually transcribes something-- the process
	is called transcription, and I''m going to do a pretty gross simplification of
	it, but I think it''ll give you the gist of how it codes for proteins. So what
	happens when transcription happens is that these two strands split up, and one
	of the strands-- let me just take one of them. Let''s say it looks like this.
	I''ll do it all in one color. Let''s say it''s just ATGGACG-- I''m just making
	up stuff-- TA. Let''s say that that''s the strand that got split up. And what
	happens is it transcribes-- and I won''t say itself. There''s a whole bunch of
	enzymes and proteins and a whole bunch of chemical reactions that have to happen,
	but this DNA essentially transcribes a complementary mRNA. And I''ll introduce
	RNA.   It''s essentially the exact same thing as-- well, the word is ribonucleic
	acid, so it''s literally-- you get rid of the deoxy, so you can kind of say it''s
	got its oxy, and it''s ribonucleic acid, but it''s very similar to DNA. It codes
	in the exact same way. The only difference between RNA, instead of a thymine,
	it has something called a uracil. So every place where you would have expected
	a thymine, you would have expected a T, you''ll now see a U. So, for example,
	if this is the DNA strand, then an RNA, an mRNA, in a messenger RNA strand, will
	be built complementary to this. So it''ll be built-- let''s see. With A, you''d
	normally have thymine when you''re talking DNA, but now we''re talking RNA, so
	it''ll be a uracil, then an adenine, cytosine, cytosine, uracil, then we got a
	guanine, a cytosine, an adenine, and then we''ll have a uracil. So this is the
	mRNA strand here. And all of this is occurring inside the nucleus of your cells.
	And we''ll do a whole series of videos in the future about the structure of our
	cells, but I think most of us know that our cells-- and I''ll talk more about
	eukaryotic and prokaryotic organisms in the future, but most complex organisms,
	they have a cell nucleus where we have all of our chromosomes that contain all
	of our DNA. And so this mRNA then detaches itself from the DNA that it was transcribed
	from, and then it leaves the nucleus, and it goes to these structures called ribosomes.
	I''m oversimplifying it a little bit, but at the ribosomes, this mRNA is translated
	into proteins. So let me do that. So let''s say this is the mRNA. It was transcribed
	from that DNA, so let me get rid of that DNA now. I got rid of the DNA. This is
	the mRNA that we were able to transcribe from that DNA, and they have these other
	things called tRNA or transfer RNA. And what these are-- and this is the really
	interesting part. So you may or may not know that pretty much everything we are
	is made up of proteins. And these proteins, the building blocks of proteins are
	amino acids. And for those of you who like to lift weights, I''m sure you''ve
	seen ads for amino acid supplements and things of the like. And the reason why
	they talk about amino acids is because those are the building blocks of proteins.
	My son actually has an allergy to milk protein, so we had to get him a formula
	that was just pure amino acids, just all of the milk proteins broken down. So
	if you look at a protein, it''s actually a chain of these amino acids and usually
	a fairly long chain. We''ll look at some protein structures in the very near future,
	just to give you an idea of things. It''s a very long chain of these amino acids,
	and there are actually 20 different amino acids. Twenty different amino acids
	are pretty much the structure of all of our proteins. Let me write that.
	So a very obvious question is how can these things code for 20 different amino
	acids? I can only have four different things in this little bucket right here.
	And then you just have to go back to your combinatorics, or if you can''t go back
	to it to watch the playlist on probability and combinatorics, and say, OK, there''s
	only four ways that I can have for each of these bases. There''s only four different
	bases that I can have here, either an adenine guanine, cytosine or, depending
	on whether we''re talking about DNA or RNA, a uracil or a thymine. But how can
	we increase the combinations? Well, if we include two of them, if we include two
	bases, then how many combinations can we have? Well, we have four possibilities
	here, then we''d have four possibilities here, so we''d have 16 possibilities.
	But that''s still not enough. That''s still not enough to code for one of 20 amino
	acids to say, hey, this is going to code for amino acid number five, and we''ll
	talk more about their actual names. So what do we have to do? Well, we have to
	use three of them. So three of them, there''s actually four times four times four
	possibilities here, so they could code for 64 different things. They could take
	on 64 different combinations or permutations, this UAC right here. So if we have
	three of these bases, we can actually code for an amino acid. Actually, it''s
	overkill, because we can actually have 64 combinations here, and there are only
	20 amino acids, so we can even have redundant combinations code for different
	amino acids. For example, we might say that, and this isn''t the actual code,
	but maybe UAC, and I should look these up. This codes for amino acid number 1.
	And if it was AAU, then this codes for amino acid number 2. And if I have-- I
	mean, I think you get the idea. If I have GGG, this codes for amino acid number
	10. And what happens is when this messenger RNA leaves the nucleus, it goes to
	the ribosomes, and at the ribosomes-- we''re going to look at that diagram in
	a few seconds-- but at the ribosomes-- let me take my same mRNA molecule. And
	they''re much longer than what I''m showing here. This is just a fraction of an
	mRNA molecule.   So I''ll take my mRNA molecule, and what they do is they
	essentially act as a template for tRNA molecules. And tRNA molecules are these
	molecules that are attached to the-- they''re almost like the trucks for the amino
	acids. So let''s say I have some amino acid right here, and then I have another
	amino acid that''s right here like that, and then I have another amino acid that''s
	like that. They''ll be attached to tRNA molecules. So let''s say that this tRNA
	molecule has on it-- so this amino acid is attached to a tRNA molecule that has
	the code on it A-- let me do it in a darker color. It has the code AUG.
	This one right here has the code-- let me pick another one. Let''s say it has
	GGAC.   So what''s going to happen? When you''re in the ribosome, and it''s
	a complex situation, but actually what''s happening isn''t too fancy. This tRNA,
	it wants to bond to this part of the mRNA. Why? Because adenine bonds with uracil,
	uracil bonds with adenine, and guanine bonds with cyotsine, so it''ll pull up
	right here. It''ll pull up right next to this thing, and actually, I should probably--
	well, I don''t know if I can rotate it. But it''ll just pull up right here and
	attach to this mRNA molecule. And this right here is tRNA.   This is mRNA.
	And the names don''t matter. I really just want to give you the big picture idea
	of how the proteins are actually formed. And this is an amino acid. I don''t know,
	let''s call it amino acid 1, amino acid 5, amino acid 20. This guy, he''s going
	to pull up right here. The guanine is attracted to the cytosine, and if you watch
	the chemistry videos, these are actually hydrogen bonds that form the base pairs.
	Adenine, wants to pull up to uracil, cytosine to guanine, and so on and so forth.
	And so once all of these guys have pulled up-- let me do that. So once you''ve
	pulled up, let''s say that this is-- I could do it up here. This is my mRNA molecule.
	I''m not going to draw the specifics right there. My little tRNA''s pull up, pull
	up next to it, and they each hold a payload, right? So this first one holds this
	payload right here of this amino acid. The second one holds this payload of this
	amino acid and so forth and so on. And so it might keep going, and there''s another
	green amino acid here. They really don''t have those colors, but I''m just-- just
	for the sake of simplicity like that. And then the amino acids bond to each other
	when they''re held like that close to each other. This doesn''t happen all by
	itself. The ribosome serves a purpose, and there are enzymes that facilitate this
	process, but once these guys bond together, the tRNA detaches, and you have this
	chain of amino acids. And then the chain of amino acids starts to bend around
	so they have all of these-- and it''s actually a fascinating-- I mean, people
	spend their lives studying how proteins fold, and that''s actually where they
	get most of their structural properties. It''s not just the chain of the amino
	acids, but what''s more important is how these amino acids actually fold. So once
	you fold them, they form these really ultracomplex patterns based on what amino
	acid is attracted to what other amino acid in these very intricate three-dimensional
	shapes. And what I took here from Wikipedia is these are some amino acids. And
	just to be able to relate this to the DNA, this right here is insulin. It''s key
	in our ability to process glucose in our body. So this right here is insulin.
	It''s a hormone. So sometimes you hear people talk about your immune system. Sometimes
	you hear people talking about your endocrine system and hormones, sometimes your
	digestive system. This is hemoglobin, what essentially transports our oxygen in
	our blood. But all of these things are proteins, and all these little, little
	folds you see, these are all little amino-- I mean, they''re just little dots
	of amino acids. Some of these are multiple chains of amino acids kind of fitting
	together like a big puzzle, but some of them or just single chains of amino acids.
	For insulin right here, this is 50 amino acids. And then once the chain forms,
	it all bundles together and forms this little blob like you see, but the shape
	of that blob is super important for insulin being able to perform the function
	that it needs to perform in our systems. But this right here is approximately
	50-- I forgot the exact number-- amino acids.   This right here, this immunoglobulin
	G, which is part of our immune system, this is roughly 1,500 amino acids. So how
	much DNA or how many base pairs had to code for this? Well, three times as much,
	right? Because you have to have three base pairs that code for one amino acid,
	and actually, three base pairs, this is called a codon, because it codes for amino
	acids. So three base pairs make a codon. So if you have 50 amino acids that make
	up insulin, that means you''re going to have to have 50 codons, which means you
	have to have 150 bases or 150 of these A''s and G''s and T''s. If you have 1,500
	amino acids, that means you''re going to have to have 1,500 codons, which means
	you''re going to have roughly 4,500 of these base pairs that code for it. Now,
	there are some notions that get confused a lot, so I went to kind of the smallest
	level of our DNA right here, and this is the level at which-- well, this is RNA
	that I''m pointing to right there, but this is the smallest level of DNA, and
	that''s the level at which the information is actually coded. But how does that
	relate to things like genes and chromosomes and things that you might talk about
	in other contexts?   So let''s say the 150 base pairs that coded for insulin,
	these make up a gene.   And these 4,500 base pairs make up another gene.
	Now, all of the genes don''t make proteins, but all of the proteins are made by
	genes. So let''s say I have just a bunch of-- I''ll just make another A, G, and
	it goes down, down, down, and you have a T and then a C and a C, and let''s say
	I have 4,500 of these. These could code for a protein. These could code for protein,
	or they could have all of these other kind of regulatory functions telling what
	other parts of the DNA should and should not be coded and how the DNA behaves,
	so it becomes super, super complex. But this kind of section of our DNA, this
	is what we refer to as a gene, and a gene can have anywhere from a couple of hundreds
	of these base pairs or these bases to several thousand of these base pairs. Now,
	a gene is that part of our chromosome that codes for a particular protein or serves
	a certain function. Now, there are different versions of genes.   It''s a
	gross oversimplification, but let me say this is the gene for insulin.
	Now, there might be slight variations in how insulin can be coded for, and I''m
	kind of going out of my domain right here, because I don''t know if that''s true.
	And maybe I shouldn''t just speak specifically about insulin, but it''s coding
	for some protein, but there''s maybe multiple different ways that that protein
	can be coded. Maybe instead of a T here, sometimes there''s a C there. It still
	codes for the same protein. It doesn''t change it quite enough, but that protein
	acts just a little bit different. It''s a slight variant. I''ll use that word.
	Now, each variant of this gene is called an allele.   It''s a specific variant
	of your gene.   Now, if you take this DNA chain, and this chain over here--
	let''s see. This is one base pair. This might be like one base. This is another
	base. Maybe this is an adenine and then this would be a thymine over here in green.
	This is an adenine and this would be a thymine. If right here this is a guanine,
	then right here would be a cytosine. This would be just a very small section.
	If I were to like zoom out, and let''s say we have a big chain of DNA where each
	of these little dots are a base pair that I''m drawing here, maybe this section
	codes for gene 1. And then there''s some noise or things that we haven''t fully
	understood yet. Now, I want to be clear. Just with a simple discussion of DNA,
	we''re already kind of approaching the frontiers of what we know and what we don''t
	know, because DNA is hugely complex, and there''s all of these feedback structures,
	and certain genes tell you to code for other genes and not to code for other genes
	and to code under certain circumstances, hugely complex. So there''s huge sections
	of DNA that we still don''t understand what exactly they do. But then maybe they''ll
	have another section here that codes for gene 2. Maybe gene 2 is a little bit
	longer. Maybe it''s 1,000 base pairs. But when you take all of these and you turn
	it into a-- it kind of winds in on itself like this. Let me do it. So it''ll wind
	up, winding in on itself like this and do all sorts of crazy things. Remember,
	it completely bundles itself up, and then it looks something like that. Then you
	get a chromosome.   And just to get an idea of how large a chromosome is
	compared to the actual base pairs, chromosome number one in the human genome--
	so we have 23 pairs. If you look at it inside of a nucleus-- so let''s say that''s
	the nucleus. Let''s say this is the cell. The cell is much bigger than what I''m
	showing. But we have 23 pairs of chromosomes.   I won''t do all of them.
	You can actually see chromosomes in a not-too-expensive microscope, so we''re
	already getting to a scale that we can start to look at. But the largest chromosome,
	which is chromosome number one in the human genome, just to give an idea of how
	much information it''s packing, that thing right there has 220 million base pairs.
	Sometimes people talk about chromosomes and genetics and genes and base pairs
	interchangeably, but it''s very important to kind of get an idea of scale. These
	chromosomes are a super-long strand of DNA that''s all configured and bundled
	up, and it contains 220 million base pairs. So the actual elements that are coding
	for the information are unbelievably small relative to the chromosome itself.
	But now that we understand a little bit, and actually I want to take a look back
	at this, because this kind of blows my mind, that if you just take those little
	combinations of those amino acids, you can form these very intricate, very advanced
	structures that we''re still fully understanding how they actually interact with
	each other and regulate how all of our biological processes work. And what''s
	even more amazing is that this scheme that I''ve talked about in this video about
	DNA to mRNA to tRNA to these molecules, this is true for all of life on our planet,
	so we all share this same mechanism. Me and this plant, we share that common root
	that we all have DNA. As different as me and that roach that I might not like
	to be in the same room, we all share that same common root of DNA and that all
	of it codes to proteins in this exact same way, that there''s this commonality
	amongst all life. That, to me, is mind blowing. Then even more mind blowing is
	how these very complex shapes are formed by the DNA. And this isn''t speculation.
	This is observed behavior. This is a fascinating structure right here, but it''s
	just based on 20 amino acid-- you can almost view the amino acid as the LEGOS,
	and you put the LEGOS together, and just the chemical interactions form these
	fairly impressive structures right here. So now that we know a little bit about
	DNA and how it codes into protein, we can take a little jump back and talk a little
	bit more about how variation is actually introduced into a population.  '
	- source_sentence: 'Explore. Assessments. Cell. Cell Structure and Micro-organisms.
	Grade 7. Science channel. '
	sentences:
	- 'Area Builder. Create your own shapes using colorful blocks and explore the relationship
	between perimeter and area. Compare the area and perimeter of two shapes side-by-side.
	Challenge yourself in the game screen t. '
	- 'Cells Practice. . '
	- ': Human Actions and the Sixth Mass Extinction. . This is one of the most powerful
	birds (http://www.ck12.org/biology/Birds) in the world. Could it go extinct?


	The Philippine Eagle, also known as the Monkey-eating Eagle, is among the rarest,
	largest, and most powerful birds (http://www.ck12.org/biology/Birds) in the world.
	It is critically endangered, mainly due to massive loss of habitat due to deforestation
	in most of its range. Killing a Philippine Eagle is punishable under Philippine
	law by twelve years in jail and heavy fines.


	Human Actions and the Sixth Mass Extinction


	Over 99 percent of all species that ever lived on Earth have gone extinct. Five
	mass extinctions (http://www.ck12.org/life-science/Mass-Extinctions-in-Life-Science)
	are recorded in the fossil record (http://www.ck12.org/biology/The-Fossil-Record).
	They were caused by major geologic and climatic events. Evidence shows that a
	sixth mass extinction is occurring now. Unlike previous mass extinctions (http://www.ck12.org/life-science/Mass-Extinctions-in-Life-Science),
	the sixth extinction is due to human actions.


	Some scientists consider the sixth extinction to have begun with early hominids
	during the Pleistocene. They are blamed for over-killing big mammals such as mammoths.
	Since then, human actions have had an ever greater impact on other species. The
	present rate of extinction is between 100 and 100,000 species per year. In 100
	years, we could lose more than half of Earth’s remaining species.


	Causes of Extinction


	The single biggest cause of extinction today is habitat loss. Agriculture (http://www.ck12.org/chemistry/Agriculture),
	forestry, mining, and urbanization have disturbed or destroyed more than half
	of Earth’s land area. In the U.S., for example, more than 99 percent of tall-grass
	prairies have been lost. Other causes of extinction today include:


	Exotic species introduced by humans into new habitats. They may carry disease,
	prey on native species, and disrupt food webs. Often, they can out-compete native
	species because they lack local predators. An example is described in Figure below
	(http://www.ck12.org/book/CK-12-Biology-Concepts/section/6.26/#x-ck12-QmlvLTEyLTIzLWJyb3duLXRyZWUtc25ha2U.).


	Over-harvesting of fish (http://www.ck12.org/biology/Fish), trees, and other organisms.
	This threatens their survival and the survival of species that depend on them.


	Global climate change, largely due to the burning of fossil fuels. This is raising
	Earth’s air and ocean temperatures. It is also raising sea levels. These changes
	threaten many species.


	Pollution, which adds chemicals, heat (http://www.ck12.org/physical-science/Heat-in-Physical-Science),
	and noise to the environment beyond its capacity to absorb them. This causes widespread
	harm to organisms.


	Human overpopulation, which is crowding out other species. It also makes all the
	other causes of extinction worse.


	The brown tree snake is an exotic species that has caused many extinctions on
	Pacific islands such as Guam.


	Effects of Extinction


	The results of a study released in the summer of 2011 have shown that the decline
	in the numbers of large predators like sharks, lions and wolves is disrupting
	Earth''s ecosystem in all kinds of unusual ways. The study, conducted by scientists
	from 22 different institutions in six countries, confirmed the sixth mass extinction.
	The study states that this mass extinction differs from previous ones because
	it is entirely driven by human activity through changes in land use, climate,
	pollution, hunting, fishing and poaching. The effects of the loss of these large
	predators can be seen in the oceans and on land.


	Fewer cougars in the western US state of Utah led to an explosion of the deer
	population. The deer ate more vegetation, which altered the path of local streams
	and lowered overall biodiversity (http://www.ck12.org/biology/Biodiversity).


	In Africa, where lions and leopards are being lost to poachers, there is a surge
	in the number of olive baboons, who are transferring intestinal parasites to humans
	living nearby.


	In the oceans, industrial whaling led a change in the diets of killer whales,
	who eat more sea lions, seals, and otters and have dramatically lowered the population
	counts of those species.


	The study concludes that the loss of big predators has likely driven many of the
	pandemics, population collapses and ecosystem shifts the Earth has seen in recent
	centuries.


	Disappearing Frogs


	Around the world, frogs are declining at an alarming rate due to threats like
	pollution, disease, and climate change. Frogs bridge the gap between water (http://www.ck12.org/biology/Water-Advanced)
	and land habitats, making them the first indicators (http://www.ck12.org/chemistry/Indicators)
	of ecosystem changes.


	Nonnative Species


	Scoop a handful of critters out of the San Francisco Bay and you''ll find many
	organisms from far away shores. Invasive kinds of mussels, fish (http://www.ck12.org/biology/Fish),
	and more are choking out native species, challenging experts around the state
	to change the human behavior that brings them here.


	How You Can Help Protect Biodiversity


	There are many steps you can take to help protect biodiversity (http://www.ck12.org/biology/Biodiversity).
	For example:


	Consume wisely. Reduce your consumption wherever possible. Re-use or recycle rather
	than throw out and buy new. When you do buy new, choose products that are energy
	(http://www.ck12.org/physics/Energy) efficient and durable.


	Avoid plastics. Plastics are made from petroleum and produce toxic waste.


	Go organic. Organically grown food is better for your health. It also protects
	the environment from pesticides and excessive nutrients in fertilizers.


	Save energy (http://www.ck12.org/physics/Energy). Unplug electronic equipment
	and turn off lights when not in use. Take mass transit instead of driving.


	Lost Salmon


	Why is the salmon population of Northern California so important? Salmon do not
	only provide food for humans, but also supply necessary nutrients for their ecosystems
	(http://www.ck12.org/biology/Ecosystems). Because of a sharp decline in their
	numbers, in part due to human interference, the entire salmon fishing season off
	California and Oregon was canceled in both 2008 and 2009. The species in the most
	danger of extinction is the California coho salmon.


	Summary


	Evidence shows that a sixth mass extinction is occurring. The single biggest cause
	is habitat loss caused by human actions.


	There are many steps you can take to help protect biodiversity. For example, you
	can use less energy (http://www.ck12.org/physics/Energy).


	Review


	How is human overpopulation related to the sixth mass extinction?


	Why might the brown tree snake or the Philippine Eagle serve as “poster species”
	for causes of the sixth mass extinction?


	Describe a hypothetical example showing how rising sea levels due to global (http://www.ck12.org/earth-science/Global-Warming)warming
	(http://www.ck12.org/earth-science/Global-Warming) might cause extinction.


	Create a poster that conveys simple tips for protecting biodiversity.


	Resources'
	- source_sentence: 'Classifying geometric shapes. Plane figures. 4th grade. Math by
	grade. Khan Academy (English - US curriculum). '
	sentences:
	- 'Classifying shapes by lines and angles. Lindsay classifies a shape based on hints
	about its sides and angles.


	. - [Voiceover] Which shape matches all three clues? So here we have three clues
	and we want to see which shape down below matches all three of these statements.
	So let''s start with the first clue. The first clue says the shape is a quadrilateral,
	quad meaning four-sided. So looking down here at our shapes, let''s see which
	ones match that first clue. Shape one has one, two, three, four sides. So it is
	a quadrilateral. Shape two has one, two, three, four sides. So also a quadrilateral.
	Shape three has one, two, three, four, five, six sides. So it is not a quadrilateral.
	It''s a six-sided shape or a hexagon. So we can rule that one out. It doesn''t
	match clue one so there''s no way it can match all three clues. And finally shape
	four has one, two, three, four sides again so it is also a quadrilateral. So after
	clue one, we still have three possible answers. This first shape, the second shape,
	and the fourth shape all match clue one, they''re all quadrilaterals. Looking
	at clue two, it says our shape has no right angles. Right angles are also 90 degree
	angles. Right angles are 90 degree angles and they look something like this and
	we often see them marked with a square in the middle because they are sort of
	like square angles. We can create a square from the opening that they form, that
	these angles form. So this is a right angle. Looking now down at our shapes, we
	can see right away on shape one has two right angles. There''s a square corner
	and another square corner. So this has right angles, but the shape we''re looking
	for has no right angles so we can rule this shape out. Shape two does not have
	any right angles. These are not squared off corners. And same with shape four,
	no right angles. So both of those still match both clues one and two. So we have
	two shapes left. They''re both quadrilaterals and they have no right angles. And
	finally our last clue, the shape has four sides, we knew that ''cause it was a
	quadrilateral, and those sides are of equal length. That means each of the sides
	is the same length. Looking at this first one that we have left, shape two, it
	looks like these sides on the ends are shorter than the sides going up and down.
	So it looks like they are not equal length. So we can rule this one out. But let''s
	be sure this last one works. Here the sides all look like they''re the same length,
	but the way we can know for sure that they are is these tick marks. Any time you
	have these marks, it''s saying that any side that has the same amount of marks
	is the same length. All four of these sides have exactly one tick mark so they
	are all equal in length. So shape four matches all three clues. It is a quadrilateral,
	there are no right angles and it has four sides of equal length. So shape four
	is our answer.'
	- 'Resistors in Series. . '
	- 'Amoeba in motion. This a video of an Amoeba . Movement of the Amoeba is shown.
	First the colorless ectoplasma moves in front of the pseodopodia, followed by
	the grained entoplasma. The video is done with the phase contrast technique. Please
	have a look at my homepage for more:

	http://www.dr-ralf-wagner.de. '
	- source_sentence: 'Electromagnet. Electricity and Magnetism. Physical Science. Science.
	K-12. '
	sentences:
	- 'Determining Unknown Angles in Complex Composite Figures Practice. . '
	- 'Electromagnet. . '
	- "Literal vs figurative language Exercise. . It this an example of literal or figurative\
	\ language? \n\nHe has lost his marbles.\n\n- Literal\n- Figurative\n- It could\
	\ be both.\n\n\nHas the word literally been used correctly in this sentence?\n\
	\nStars are literally millions of kilometres away.\n\n- Yes\n- No\n\n\nHas the\
	\ word literally been used correctly in this sentence? \n\nI haven't been to\
	\ a comic book store in literally a million years.\n\n- Yes\n- No\n\n\nIs this\
	\ an example of literal or figurative language? \n\nThe old wall is falling apart.\n\
	\n- Literal\n- Figurative\n- It could be both.\n\n\nIs this an example of literal\
	\ or figurative language? \n\nOur debating team is falling apart.\n\n- Literal\n\
	- Figurative\n- It could be both.\n\n\nIs this an example of literal or figurative\
	\ language? \n\nI am feeling blue.\n\n- Literal\n- Figurative\n- It could be\
	\ both.\n\n\nIs this an example of literal or figurative language?\n\nThe sky\
	\ is blue.\n\n- Literal\n- Figurative\n- It could be both.\n\n\nWhat is the danger\
	\ of writing using only literal language?\n\n- The language can be dry and boring.\n\
	- Meaning can be lost.\n- Meaning can be exaggerated.\n- There are no dangers\
	\ of writing in literal language.\n\n\nWhich of these is most likely to be written\
	\ using literal language?\n\n- A recipe\n- A poem\n- A soliloquy\n- A short story\n\
	\n\nWhich of the following would you not find in literal language?\n\n- Descriptive\
	\ words\n- Direct language\n- Exactly what's happening in the story\n- Similes"
	- source_sentence: 'Determining Unknown Angles in Complex Composite Figures. Triangles.
	Geometry. Grade 4. Elementary Math. Math. K-12. '
	sentences:
	- 'Determining Unknown Angles in Complex Composite Figures. . '
	- 'Area of parallelograms. . '
	- 'Initial value & common ratio of exponential functions. Get comfortable with the
	basic ingredients of exponential functions: the

	Initial value and the common ratio.


	. - [Voiceover] So let''s think about a function. I''ll just give an example.
	Let''s say, h of n is equal to one-fourth times two to the n. So, first of all,
	you might notice something interesting here. We have the variable, the input into
	our function. It''s in the exponent. And a function like this is called an exponential
	function. So this is an exponential. Ex-po-nen-tial. Exponential function, and
	that''s because the variable, the input into our function, is sitting in its definition
	of what is the output of that function going to be. The input is in the exponent.
	I could write another exponential function. I could write, f of, let''s say the
	input is a variable, t, is equal to is equal to five times times three to the
	t. Once again, this is an exponential function. Now there''s a couple of interesting
	things to think about in exponential function. In fact, we''ll explore many of
	them, but I''ll get a little used to the terminology, so one thing that you might
	see is a notion of an initial value. In-i-tial Intitial value. And this is essentially
	the value of the function when the input is zero. So, for in these cases, the
	initial value for the function, h, is going to be, h of zero. And when we evaluate
	that, that''s going to be one-fourth times two to the zero. Well, two to the zero
	power, is just one. So it''s equal to one-fourth. So the initial value, at least
	in this case, it seems to just be that number that sits out here. We have the
	initial value times some number to this exponent. And we''ll come up with the
	name for this number. Well let''s see if this was true over here for, f of t.
	So, if we look at its intial value, f of zero is going to be five times three
	to the zero power and, the same thing again. Three to the zero is just one. Five
	times one is just five. So the initial value is once again, that. So if you have
	exponential functions of this form, it makes sense. Your initial value, well if
	you put a zero in for the exponent, then the number raised to the exponent is
	just going to be one, and you''re just going to be left with that thing that you''re
	multiplying by that. Hopefully that makes sense, but since you''re looking at
	it, hopefully it does make a little bit. Now, you might be saying, well what do
	we call this number? What do we call that number there? Or that number there?
	And that''s called the common ratio. The common common ratio. And in my brain,
	we say well why is it called a common ratio? Well, if you thought about integer
	inputs into this, especially sequential integer inputs into it, you would see
	a pattern. For example, h of, let me do this in that green color, h of zero is
	equal to, we already established one-fourth. Now, what is h of one going to be
	equal to? It''s going to be one-fourth times two to the first power. So it''s
	going to be one-fourth times two. What is h of two going to be equal to? Well,
	it''s going to be one-fourth times two squared, so it''s going to be times two
	times two. Or, we could just view this as this is going to be two times h of one.
	And actually I should have done this when I wrote this one out, but this we can
	write as two times h of zero. So notice, if we were to take the ratio between
	h of two and h of one, it would be two. If we were to take the ratio between h
	of one and h of zero, it would be two. That is the common ratio between successive
	whole number inputs into our function. So, h of I could say h of n plus one over
	h of n is going to be equal to is going to be equal to actually I can work it
	out mathematically. One-fourth times two to the n plus one over one-fourth times
	two to the n. That cancels. Two to the n plus one, divided by two to the n is
	just going to be equal to two. That is your common ratio. So for the function
	h. For the function f, our common ratio is three. If we were to go the other way
	around, if someone said, hey, I have some function whose initial value, so let''s
	say, I have some function, I''ll do this in a new color, I have some function,
	g, and we know that its initial initial value is five. And someone were to say
	its common ratio its common ratio is six, what would this exponential function
	look like? And they''re telling you this is an exponential function. Well, g of
	let''s say x is the input, is going to be equal to our initial value, which is
	five. That''s not a negative sign there, Our initial value is five. I''ll write
	equals to make that clear. And then times our common ratio to the x power. So
	once again, initial value, right over there, that''s the five. And then our common
	ratio is the six, right over there. So hopefully that gets you a little bit familiar
	with some of the parts of an exponential function, why they are called what they
	are called.'
	pipeline_tag: sentence-similarity
	library_name: sentence-transformers
	metrics:
	- cosine_accuracy@1
	- cosine_accuracy@3
	- cosine_accuracy@5
	- cosine_accuracy@10
	- cosine_precision@10
	- cosine_precision@50
	- cosine_precision@100
	- cosine_recall@10
	- cosine_recall@50
	- cosine_recall@100
	- cosine_ndcg@10
	- cosine_mrr@10
	- cosine_map@100
	model-index:
	- name: SentenceTransformer
	results:
	- task:
	type: information-retrieval
	name: Information Retrieval
	dataset:
	name: eval ir
	type: eval-ir
	metrics:
	- type: cosine_accuracy@1
	value: 0.6326203208556149
	name: Cosine Accuracy@1
	- type: cosine_accuracy@3
	value: 0.7914438502673797
	name: Cosine Accuracy@3
	- type: cosine_accuracy@5
	value: 0.8481283422459893
	name: Cosine Accuracy@5
	- type: cosine_accuracy@10
	value: 0.8967914438502674
	name: Cosine Accuracy@10
	- type: cosine_precision@10
	value: 0.23825311942959004
	name: Cosine Precision@10
	- type: cosine_precision@50
	value: 0.0709126559714795
	name: Cosine Precision@50
	- type: cosine_precision@100
	value: 0.03923529411764706
	name: Cosine Precision@100
	- type: cosine_recall@10
	value: 0.7040714788488945
	name: Cosine Recall@10
	- type: cosine_recall@50
	value: 0.8725457895726481
	name: Cosine Recall@50
	- type: cosine_recall@100
	value: 0.9169531730172458
	name: Cosine Recall@100
	- type: cosine_ndcg@10
	value: 0.652860842686591
	name: Cosine Ndcg@10
	- type: cosine_mrr@10
	value: 0.7233662960133574
	name: Cosine Mrr@10
	- type: cosine_map@100
	value: 0.5971091711102727
	name: Cosine Map@100
	---

	# SentenceTransformer

	This is a [sentence-transformers](https://www.SBERT.net) model trained. It maps sentences & paragraphs to a 768-dimensional dense vector space and can be used for semantic textual similarity, semantic search, paraphrase mining, text classification, clustering, and more.

	## Model Details

	### Model Description
	- Model Type: Sentence Transformer
	<!-- - Base model: [Unknown](https://huggingface.co/unknown) -->
	- Maximum Sequence Length: 128 tokens
	- Output Dimensionality: 768 dimensions
	- Similarity Function: Cosine Similarity
	<!-- - Training Dataset: Unknown -->
	<!-- - Language: Unknown -->
	<!-- - License: Unknown -->

	### Model Sources

	- Documentation: [Sentence Transformers Documentation](https://sbert.net)
	- Repository: [Sentence Transformers on GitHub](https://github.com/UKPLab/sentence-transformers)
	- Hugging Face: [Sentence Transformers on Hugging Face](https://huggingface.co/models?library=sentence-transformers)

	### Full Model Architecture

	```
	SentenceTransformer(
	(0): Transformer({'max_seq_length': 128, 'do_lower_case': False}) with Transformer model: MPNetModel
	(1): Pooling({'word_embedding_dimension': 768, 'pooling_mode_cls_token': False, 'pooling_mode_mean_tokens': True, 'pooling_mode_max_tokens': False, 'pooling_mode_mean_sqrt_len_tokens': False, 'pooling_mode_weightedmean_tokens': False, 'pooling_mode_lasttoken': False, 'include_prompt': True})
	(2): Normalize()
	)
	```

	## Usage

	### Direct Usage (Sentence Transformers)

	First install the Sentence Transformers library:

	```bash
	pip install -U sentence-transformers
	```

	Then you can load this model and run inference.
	```python
	from sentence_transformers import SentenceTransformer

	# Download from the 🤗 Hub
	model = SentenceTransformer("sentence_transformers_model_id")
	# Run inference
	sentences = [
	'Determining Unknown Angles in Complex Composite Figures. Triangles. Geometry. Grade 4. Elementary Math. Math. K-12. ',
	'Determining Unknown Angles in Complex Composite Figures. . ',
	"Initial value & common ratio of exponential functions. Get comfortable with the basic ingredients of exponential functions: the\nInitial value and the common ratio.\n\n. - [Voiceover] So let's think about a function. I'll just give an example. Let's say, h of n is equal to one-fourth times two to the n. So, first of all, you might notice something interesting here. We have the variable, the input into our function. It's in the exponent. And a function like this is called an exponential function. So this is an exponential. Ex-po-nen-tial. Exponential function, and that's because the variable, the input into our function, is sitting in its definition of what is the output of that function going to be. The input is in the exponent. I could write another exponential function. I could write, f of, let's say the input is a variable, t, is equal to is equal to five times times three to the t. Once again, this is an exponential function. Now there's a couple of interesting things to think about in exponential function. In fact, we'll explore many of them, but I'll get a little used to the terminology, so one thing that you might see is a notion of an initial value. In-i-tial Intitial value. And this is essentially the value of the function when the input is zero. So, for in these cases, the initial value for the function, h, is going to be, h of zero. And when we evaluate that, that's going to be one-fourth times two to the zero. Well, two to the zero power, is just one. So it's equal to one-fourth. So the initial value, at least in this case, it seems to just be that number that sits out here. We have the initial value times some number to this exponent. And we'll come up with the name for this number. Well let's see if this was true over here for, f of t. So, if we look at its intial value, f of zero is going to be five times three to the zero power and, the same thing again. Three to the zero is just one. Five times one is just five. So the initial value is once again, that. So if you have exponential functions of this form, it makes sense. Your initial value, well if you put a zero in for the exponent, then the number raised to the exponent is just going to be one, and you're just going to be left with that thing that you're multiplying by that. Hopefully that makes sense, but since you're looking at it, hopefully it does make a little bit. Now, you might be saying, well what do we call this number? What do we call that number there? Or that number there? And that's called the common ratio. The common common ratio. And in my brain, we say well why is it called a common ratio? Well, if you thought about integer inputs into this, especially sequential integer inputs into it, you would see a pattern. For example, h of, let me do this in that green color, h of zero is equal to, we already established one-fourth. Now, what is h of one going to be equal to? It's going to be one-fourth times two to the first power. So it's going to be one-fourth times two. What is h of two going to be equal to? Well, it's going to be one-fourth times two squared, so it's going to be times two times two. Or, we could just view this as this is going to be two times h of one. And actually I should have done this when I wrote this one out, but this we can write as two times h of zero. So notice, if we were to take the ratio between h of two and h of one, it would be two. If we were to take the ratio between h of one and h of zero, it would be two. That is the common ratio between successive whole number inputs into our function. So, h of I could say h of n plus one over h of n is going to be equal to is going to be equal to actually I can work it out mathematically. One-fourth times two to the n plus one over one-fourth times two to the n. That cancels. Two to the n plus one, divided by two to the n is just going to be equal to two. That is your common ratio. So for the function h. For the function f, our common ratio is three. If we were to go the other way around, if someone said, hey, I have some function whose initial value, so let's say, I have some function, I'll do this in a new color, I have some function, g, and we know that its initial initial value is five. And someone were to say its common ratio its common ratio is six, what would this exponential function look like? And they're telling you this is an exponential function. Well, g of let's say x is the input, is going to be equal to our initial value, which is five. That's not a negative sign there, Our initial value is five. I'll write equals to make that clear. And then times our common ratio to the x power. So once again, initial value, right over there, that's the five. And then our common ratio is the six, right over there. So hopefully that gets you a little bit familiar with some of the parts of an exponential function, why they are called what they are called.",
	]
	embeddings = model.encode(sentences)
	print(embeddings.shape)
	# [3, 768]

	# Get the similarity scores for the embeddings
	similarities = model.similarity(embeddings, embeddings)
	print(similarities.shape)
	# [3, 3]
	```

	<!--
	### Direct Usage (Transformers)

	<details><summary>Click to see the direct usage in Transformers</summary>

	</details>
	-->

	<!--
	### Downstream Usage (Sentence Transformers)

	You can finetune this model on your own dataset.

	<details><summary>Click to expand</summary>

	</details>
	-->

	<!--
	### Out-of-Scope Use

	List how the model may foreseeably be misused and address what users ought not to do with the model.
	-->

	## Evaluation

	### Metrics

	#### Information Retrieval

	* Dataset: `eval-ir`
	* Evaluated with [<code>InformationRetrievalEvaluator</code>](https://sbert.net/docs/package_reference/sentence_transformer/evaluation.html#sentence_transformers.evaluation.InformationRetrievalEvaluator)

	\| Metric \| Value \|
	\|:---------------------\|:-----------\|
	\| cosine_accuracy@1 \| 0.6326 \|
	\| cosine_accuracy@3 \| 0.7914 \|
	\| cosine_accuracy@5 \| 0.8481 \|
	\| cosine_accuracy@10 \| 0.8968 \|
	\| cosine_precision@10 \| 0.2383 \|
	\| cosine_precision@50 \| 0.0709 \|
	\| cosine_precision@100 \| 0.0392 \|
	\| cosine_recall@10 \| 0.7041 \|
	\| cosine_recall@50 \| 0.8725 \|
	\| cosine_recall@100 \| 0.917 \|
	\| cosine_ndcg@10 \| 0.6529 \|
	\| cosine_mrr@10 \| 0.7234 \|
	\| cosine_map@100 \| 0.5971 \|

	<!--
	## Bias, Risks and Limitations

	What are the known or foreseeable issues stemming from this model? You could also flag here known failure cases or weaknesses of the model.
	-->

	<!--
	### Recommendations

	What are recommendations with respect to the foreseeable issues? For example, filtering explicit content.
	-->

	## Training Details

	### Training Dataset

	#### Unnamed Dataset

	* Size: 190,175 training samples
	* Columns: <code>topic</code> and <code>content</code>
	* Approximate statistics based on the first 1000 samples:
	\| \| topic \| content \|
	\|:--------\|:------------------------------------------------------------------------------------\|:-----------------------------------------------------------------------------------\|
	\| type \| string \| string \|
	\| details \| <ul><li>min: 15 tokens</li><li>mean: 41.93 tokens</li><li>max: 128 tokens</li></ul> \| <ul><li>min: 5 tokens</li><li>mean: 62.57 tokens</li><li>max: 128 tokens</li></ul> \|
	* Samples:
	\| topic \| content \|
	\|:------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------\|:---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------\|
	\| <code>Triangles and polygons. Space, shape and measurement. Form 1. Malawi Mathematics Syllabus. Learning outcomes: students must be able to solve problems involving angles, triangles and polygons including: types of triangles, calculate the interior and exterior angles of a triangle, different types of polygons, interior angles and sides of a convex polygon, the size and exterior angle of any convex polygon.</code> \| <code>Regular and Irregular Polygons. . </code> \|
	\| <code>Triangles and polygons. Space, shape and measurement. Form 1. Malawi Mathematics Syllabus. Learning outcomes: students must be able to solve problems involving angles, triangles and polygons including: types of triangles, calculate the interior and exterior angles of a triangle, different types of polygons, interior angles and sides of a convex polygon, the size and exterior angle of any convex polygon.</code> \| <code>Classifying triangles based on its angles. A triangle is a closed figure consisting of three-line segments which are joined end to end. The joined line segments of a triangle form three angles. You can classify triangles according to sides and angles.. Classifying triangles based on its angles<br>Albert Mhango, Mzimba<br>Introduction:<br>A triangle is a closed figure consisting of three-line segments which are joined end to<br>end. The joined line segments of a triangle form three angles. You can classify<br>triangles according to sides and angles.<br><br>What is an interior angle? An interior angle is an inside of a shape.<br><br>Explanation:<br>When classifying triangles according to its angles, you look at the sizes of their<br>interior angles. Under this classification, you have the following types of triangles:<br>1. Acute angled triangle: A triangle in which all interior angles are acute angles. Do<br>you remember the meaning of acute angle? It is an angle which is less than 90°.<br>Figure shows an example of an acute an...</code> \|
	\| <code>Triangles and polygons. Space, shape and measurement. Form 1. Malawi Mathematics Syllabus. Learning outcomes: students must be able to solve problems involving angles, triangles and polygons including: types of triangles, calculate the interior and exterior angles of a triangle, different types of polygons, interior angles and sides of a convex polygon, the size and exterior angle of any convex polygon.</code> \| <code>Classifying triangles. Learn to categorize triangles as scalene, isosceles, equilateral, acute,<br>right, or obtuse.<br><br>. What I want to do in this video is talk about the two main ways that triangles are categorized. The first way is based on whether or not the triangle has equal sides, or at least a few equal sides. Then the other way is based on the measure of the angles of the triangle. So the first categorization right here, and all of these are based on whether or not the triangle has equal sides, is scalene. And a scalene triangle is a triangle where none of the sides are equal. So for example, if I have a triangle like this, where this side has length 3, this side has length 4, and this side has length 5, then this is going to be a scalene triangle. None of the sides have an equal length. Now an isosceles triangle is a triangle where at least two of the sides have equal lengths. So for example, this would be an isosceles triangle. Maybe this has length 3, this has length 3, and this...</code> \|
	* Loss: [<code>MultipleNegativesRankingLoss</code>](https://sbert.net/docs/package_reference/sentence_transformer/losses.html#multiplenegativesrankingloss) with these parameters:
	```json
	{
	"scale": 20.0,
	"similarity_fct": "cos_sim"
	}
	```

	### Training Hyperparameters
	#### Non-Default Hyperparameters

	- `eval_strategy`: steps
	- `per_device_train_batch_size`: 128
	- `per_device_eval_batch_size`: 128
	- `learning_rate`: 2e-05
	- `num_train_epochs`: 1
	- `warmup_ratio`: 0.05
	- `fp16`: True
	- `load_best_model_at_end`: True
	- `batch_sampler`: no_duplicates

	#### All Hyperparameters
	<details><summary>Click to expand</summary>

	- `overwrite_output_dir`: False
	- `do_predict`: False
	- `eval_strategy`: steps
	- `prediction_loss_only`: True
	- `per_device_train_batch_size`: 128
	- `per_device_eval_batch_size`: 128
	- `per_gpu_train_batch_size`: None
	- `per_gpu_eval_batch_size`: None
	- `gradient_accumulation_steps`: 1
	- `eval_accumulation_steps`: None
	- `torch_empty_cache_steps`: None
	- `learning_rate`: 2e-05
	- `weight_decay`: 0.0
	- `adam_beta1`: 0.9
	- `adam_beta2`: 0.999
	- `adam_epsilon`: 1e-08
	- `max_grad_norm`: 1.0
	- `num_train_epochs`: 1
	- `max_steps`: -1
	- `lr_scheduler_type`: linear
	- `lr_scheduler_kwargs`: {}
	- `warmup_ratio`: 0.05
	- `warmup_steps`: 0
	- `log_level`: passive
	- `log_level_replica`: warning
	- `log_on_each_node`: True
	- `logging_nan_inf_filter`: True
	- `save_safetensors`: True
	- `save_on_each_node`: False
	- `save_only_model`: False
	- `restore_callback_states_from_checkpoint`: False
	- `no_cuda`: False
	- `use_cpu`: False
	- `use_mps_device`: False
	- `seed`: 42
	- `data_seed`: None
	- `jit_mode_eval`: False
	- `use_ipex`: False
	- `bf16`: False
	- `fp16`: True
	- `fp16_opt_level`: O1
	- `half_precision_backend`: auto
	- `bf16_full_eval`: False
	- `fp16_full_eval`: False
	- `tf32`: None
	- `local_rank`: 0
	- `ddp_backend`: None
	- `tpu_num_cores`: None
	- `tpu_metrics_debug`: False
	- `debug`: []
	- `dataloader_drop_last`: False
	- `dataloader_num_workers`: 0
	- `dataloader_prefetch_factor`: None
	- `past_index`: -1
	- `disable_tqdm`: False
	- `remove_unused_columns`: True
	- `label_names`: None
	- `load_best_model_at_end`: True
	- `ignore_data_skip`: False
	- `fsdp`: []
	- `fsdp_min_num_params`: 0
	- `fsdp_config`: {'min_num_params': 0, 'xla': False, 'xla_fsdp_v2': False, 'xla_fsdp_grad_ckpt': False}
	- `fsdp_transformer_layer_cls_to_wrap`: None
	- `accelerator_config`: {'split_batches': False, 'dispatch_batches': None, 'even_batches': True, 'use_seedable_sampler': True, 'non_blocking': False, 'gradient_accumulation_kwargs': None}
	- `deepspeed`: None
	- `label_smoothing_factor`: 0.0
	- `optim`: adamw_torch
	- `optim_args`: None
	- `adafactor`: False
	- `group_by_length`: False
	- `length_column_name`: length
	- `ddp_find_unused_parameters`: None
	- `ddp_bucket_cap_mb`: None
	- `ddp_broadcast_buffers`: False
	- `dataloader_pin_memory`: True
	- `dataloader_persistent_workers`: False
	- `skip_memory_metrics`: True
	- `use_legacy_prediction_loop`: False
	- `push_to_hub`: False
	- `resume_from_checkpoint`: None
	- `hub_model_id`: None
	- `hub_strategy`: every_save
	- `hub_private_repo`: None
	- `hub_always_push`: False
	- `gradient_checkpointing`: False
	- `gradient_checkpointing_kwargs`: None
	- `include_inputs_for_metrics`: False
	- `include_for_metrics`: []
	- `eval_do_concat_batches`: True
	- `fp16_backend`: auto
	- `push_to_hub_model_id`: None
	- `push_to_hub_organization`: None
	- `mp_parameters`:
	- `auto_find_batch_size`: False
	- `full_determinism`: False
	- `torchdynamo`: None
	- `ray_scope`: last
	- `ddp_timeout`: 1800
	- `torch_compile`: False
	- `torch_compile_backend`: None
	- `torch_compile_mode`: None
	- `include_tokens_per_second`: False
	- `include_num_input_tokens_seen`: False
	- `neftune_noise_alpha`: None
	- `optim_target_modules`: None
	- `batch_eval_metrics`: False
	- `eval_on_start`: False
	- `use_liger_kernel`: False
	- `eval_use_gather_object`: False
	- `average_tokens_across_devices`: False
	- `prompts`: None
	- `batch_sampler`: no_duplicates
	- `multi_dataset_batch_sampler`: proportional

	</details>

	### Training Logs
	\| Epoch \| Step \| Training Loss \| eval-ir_cosine_ndcg@10 \|
	\|:------:\|:----:\|:-------------:\|:----------------------:\|
	\| 0.0007 \| 1 \| 0.1782 \| - \|
	\| 0.1999 \| 297 \| 0.1245 \| 0.6279 \|
	\| 0.3997 \| 594 \| 0.1224 \| 0.6423 \|
	\| 0.5996 \| 891 \| 0.1168 \| 0.6493 \|
	\| 0.7995 \| 1188 \| 0.1179 \| 0.6541 \|
	\| 0.9993 \| 1485 \| 0.1227 \| 0.6529 \|


	### Framework Versions
	- Python: 3.11.13
	- Sentence Transformers: 4.1.0
	- Transformers: 4.52.4
	- PyTorch: 2.6.0+cu124
	- Accelerate: 1.7.0
	- Datasets: 2.14.4
	- Tokenizers: 0.21.1

	## Citation

	### BibTeX

	#### Sentence Transformers
	```bibtex
	@inproceedings{reimers-2019-sentence-bert,
	title = "Sentence-BERT: Sentence Embeddings using Siamese BERT-Networks",
	author = "Reimers, Nils and Gurevych, Iryna",
	booktitle = "Proceedings of the 2019 Conference on Empirical Methods in Natural Language Processing",
	month = "11",
	year = "2019",
	publisher = "Association for Computational Linguistics",
	url = "https://arxiv.org/abs/1908.10084",
	}
	```

	#### MultipleNegativesRankingLoss
	```bibtex
	@misc{henderson2017efficient,
	title={Efficient Natural Language Response Suggestion for Smart Reply},
	author={Matthew Henderson and Rami Al-Rfou and Brian Strope and Yun-hsuan Sung and Laszlo Lukacs and Ruiqi Guo and Sanjiv Kumar and Balint Miklos and Ray Kurzweil},
	year={2017},
	eprint={1705.00652},
	archivePrefix={arXiv},
	primaryClass={cs.CL}
	}
	```

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