added datasets descriptions and links

README.md

@@ -20,13 +20,25 @@ You will find below descriptions for the various input files provided, to help y
 
 ## Community provided files
 
-**8k_random_data**\
-
-**20k_random_data**\
-
 **groups_merged**\
+_"Here is a decent general purpose imatrix calibration dataset. It should be more diverse than wikitext at ~30k tokens, as it is excerpts of a larger dataset which includes coding examples (which seems quite important!)
+This means it's generally higher entropy data compared to wikitext, and it's real data rather than pseudo-randomly generated data.
+I get lower KL div than wikitext for the same length and the outputs seem qualitatively better."_ (kalomaze)\
+https://github.com/ggerganov/llama.cpp/discussions/5263#discussioncomment-8395384
 
 **group_10_merged**\
+(superseeded by groups_merged)\
+_"This is about ~50k pseudo-random tokens.
+I am getting the best balance between the maximum divergence and the other divergence statistics using this file when quantizing 7b"_ (kalomaze)\
+https://github.com/ggerganov/llama.cpp/discussions/5263#discussioncomment-8349233
+
+**20k_random_data**\
+(superseeded by groups_10_merged)\
+https://github.com/ggerganov/llama.cpp/discussions/5006#discussioncomment-8163190
+
+**8k_random_data**\
+(superseeded by 20k_random_data)\
+https://github.com/ggerganov/llama.cpp/discussions/5006#discussion-6087829
 
 **ptb.train**\
 Penn Treebank (PTB) is a widely used preprocessed large dataset designed for language training. Casing,
@@ -48,8 +60,11 @@ https://huggingface.co/datasets/wikitext
 or "good articles".\
 https://huggingface.co/datasets/asi/wikitext_fr
 
-**c4** (exllamav2)\
-Constructed from news articles?
+**c4**\
+The C4 dataset is a collection text sourced from the public Common Crawl web scrape.
+It includes heuristics to extract only natural language (as opposed to boilerplate and other gibberish)
+in addition to extensive deduplication. C4 dataset was explicitly designed to be English only:
+any page that was not given a probability of at least 99% of being English by langdetect was discarded.
 
 **code** (exllamav2)\
 Programming