Inari Sami - Wikilangs Models

Comprehensive Research Report & Full Ablation Study

This repository contains NLP models trained and evaluated by Wikilangs, specifically on Inari Sami Wikipedia data. We analyze tokenizers, n-gram models, Markov chains, vocabulary statistics, and word embeddings.

πŸ“‹ Repository Contents

Models & Assets

  • Tokenizers (8k, 16k, 32k, 64k)
  • N-gram models (2, 3, 4, 5-gram)
  • Markov chains (context of 1, 2, 3, 4 and 5)
  • Subword N-gram and Markov chains
  • Embeddings in various sizes and dimensions (aligned and unaligned)
  • Language Vocabulary
  • Language Statistics

Performance Dashboard

Analysis and Evaluation


1. Tokenizer Evaluation

Tokenizer Compression

Tokenizer Fertility

Tokenizer OOV

Total Tokens

Results

Vocab Size Compression Avg Token Len UNK Rate Total Tokens
8k 3.409x 3.41 0.2072% 253,414
16k 3.817x 3.82 0.2320% 226,314
32k 4.186x 4.19 0.2544% 206,349
64k 4.507x πŸ† 4.51 0.2739% 191,652

Tokenization Examples

Below are sample sentences tokenized with each vocabulary size:

Sample 1: (MCCCXC) lΓ’i normaalihe, mii aalgij jΓ‘ nuuvΓ’i juliaanlΓ’Ε‘ kalender mield lΓ‘vurduv...

Vocab Tokens Count
8k ▁( mccc xc ) ▁lΓ’i ▁normaalihe , ▁mii ▁aalgij ▁jΓ‘ ... (+16 more) 26
16k ▁( mccc xc ) ▁lΓ’i ▁normaalihe , ▁mii ▁aalgij ▁jΓ‘ ... (+16 more) 26
32k ▁( mccc xc ) ▁lΓ’i ▁normaalihe , ▁mii ▁aalgij ▁jΓ‘ ... (+16 more) 26
64k ▁( mccc xc ) ▁lΓ’i ▁normaalihe , ▁mii ▁aalgij ▁jΓ‘ ... (+16 more) 26

Sample 2: (MDXLIII) lΓ’i normaalihe, mii aalgij jΓ‘ nuuvΓ’i juliaanlΓ’Ε‘ kalender mield vuossaa...

Vocab Tokens Count
8k ▁( md x lii i ) ▁lΓ’i ▁normaalihe , ▁mii ... (+18 more) 28
16k ▁( mdx liii ) ▁lΓ’i ▁normaalihe , ▁mii ▁aalgij ▁jΓ‘ ... (+16 more) 26
32k ▁( mdx liii ) ▁lΓ’i ▁normaalihe , ▁mii ▁aalgij ▁jΓ‘ ... (+16 more) 26
64k ▁( mdx liii ) ▁lΓ’i ▁normaalihe , ▁mii ▁aalgij ▁jΓ‘ ... (+16 more) 26

Sample 3: (MCCL) lΓ’i normaalihe, mii aalgij jΓ‘ nuuvΓ’i juliaanlΓ’Ε‘ kalender mield lΓ‘vurduv. ...

Vocab Tokens Count
8k ▁( mcc l ) ▁lΓ’i ▁normaalihe , ▁mii ▁aalgij ▁jΓ‘ ... (+16 more) 26
16k ▁( mcc l ) ▁lΓ’i ▁normaalihe , ▁mii ▁aalgij ▁jΓ‘ ... (+16 more) 26
32k ▁( mcc l ) ▁lΓ’i ▁normaalihe , ▁mii ▁aalgij ▁jΓ‘ ... (+16 more) 26
64k ▁( mcc l ) ▁lΓ’i ▁normaalihe , ▁mii ▁aalgij ▁jΓ‘ ... (+16 more) 26

Key Findings

  • Best Compression: 64k achieves 4.507x compression
  • Lowest UNK Rate: 8k with 0.2072% unknown tokens
  • Trade-off: Larger vocabularies improve compression but increase model size
  • Recommendation: 32k vocabulary provides optimal balance for production use

2. N-gram Model Evaluation

N-gram Perplexity

N-gram Unique

N-gram Coverage

Results

N-gram Variant Perplexity Entropy Unique N-grams Top-100 Coverage Top-1000 Coverage
2-gram Word 7,928 12.95 21,306 16.4% 40.6%
2-gram Subword 438 πŸ† 8.78 3,597 52.7% 98.5%
3-gram Word 12,010 13.55 31,830 14.7% 35.6%
3-gram Subword 4,149 12.02 29,729 16.8% 56.6%
4-gram Word 25,724 14.65 62,360 10.1% 27.6%
4-gram Subword 21,915 14.42 158,183 9.5% 30.7%
5-gram Word 22,379 14.45 49,308 9.2% 27.8%
5-gram Subword 62,537 15.93 398,267 7.2% 23.3%

Top 5 N-grams by Size

2-grams (Word):

Rank N-gram Count
1 c g 5,252
2 eres soojijn 3,088
3 fÑÑdÑst eres 3,076
4 soojijn kΓ€ldeeh 2,451
5 kalender mield 1,682

3-grams (Word):

Rank N-gram Count
1 fÑÑdÑst eres soojijn 3,076
2 eres soojijn kΓ€ldeeh 2,451
3 ton vijΔ‘odΓ’h lii 890
4 juliaanlΓ’Ε‘ kalender mield 860
5 peivimeeri ij tiΓ€Δ‘ust 853

4-grams (Word):

Rank N-gram Count
1 fÑÑdÑst eres soojijn kÀldeeh 2,449
2 tΓ€rhis peivimeeri ij tiΓ€Δ‘ust 852
3 normaalihe mii aalgij jΓ‘ 638
4 aalgij jΓ‘ nuuvΓ’i juliaanlΓ’Ε‘ 638
5 lΓ’i normaalihe mii aalgij 638

5-grams (Word):

Rank N-gram Count
1 jΓ‘ nuuvΓ’i juliaanlΓ’Ε‘ kalender mield 638
2 lΓ’i normaalihe mii aalgij jΓ‘ 638
3 mii aalgij jΓ‘ nuuvΓ’i juliaanlΓ’Ε‘ 638
4 aalgij jΓ‘ nuuvΓ’i juliaanlΓ’Ε‘ kalender 638
5 normaalihe mii aalgij jΓ‘ nuuvΓ’i 638

2-grams (Subword):

Rank N-gram Count
1 i _ 96,176
2 . _ 92,482
3 s t 89,805
4 _ k 87,039
5 , _ 79,601

3-grams (Subword):

Rank N-gram Count
1 m Γ‘ Γ‘ 37,873
2 Γ‘ n u 37,015
3 Γ‘ Γ‘ n 36,800
4 n u _ 33,090
5 j Γ‘ _ 29,034

4-grams (Subword):

Rank N-gram Count
1 m Γ‘ Γ‘ n 36,631
2 Γ‘ Γ‘ n u 36,485
3 Γ‘ n u _ 32,803
4 _ j Γ‘ _ 27,818
5 l i i _ 17,588

5-grams (Subword):

Rank N-gram Count
1 m Γ‘ Γ‘ n u 36,472
2 Γ‘ Γ‘ n u _ 32,800
3 _ l i i _ 16,341
4 Γ’ m Γ‘ Γ‘ n 14,304
5 i m Γ‘ Γ‘ n 12,187

Key Findings

  • Best Perplexity: 2-gram (subword) with 438
  • Entropy Trend: Decreases with larger n-grams (more predictable)
  • Coverage: Top-1000 patterns cover ~23% of corpus
  • Recommendation: 4-gram or 5-gram for best predictive performance

3. Markov Chain Evaluation

Markov Entropy

Markov Contexts

Markov Branching

Results

Context Variant Avg Entropy Perplexity Branching Factor Unique Contexts Predictability
1 Word 0.6940 1.618 4.01 131,617 30.6%
1 Subword 0.7277 1.656 5.59 1,828 27.2%
2 Word 0.1805 1.133 1.39 526,458 82.0%
2 Subword 0.8394 1.789 5.35 10,216 16.1%
3 Word 0.0654 1.046 1.12 728,322 93.5%
3 Subword 0.8706 1.828 4.46 54,674 12.9%
4 Word 0.0361 πŸ† 1.025 1.06 814,752 96.4%
4 Subword 0.7207 1.648 2.98 243,936 27.9%

Generated Text Samples (Word-based)

Below are text samples generated from each word-based Markov chain model:

Context Size 1:

  1. jÑ suu kÀÀlis mikko manner petteri niva őkovlÒ lÒi 1 2 ella kesimÑÑnu kesimÑÑnu 12 peivi
  2. lii Ε‘oddΓ’m syemmilΓ’Ε‘ musikkΓ‘r jΓ€mimeh njuhčÒmÑÑnu 25 peeivi guo wei kiinalaΕ‘ kiΓ€isΓ‘r iivij čyeΔ‘eh ha...
  3. ive rÀÀjist fÑÑdÑst eres soojijn the colour inside daisy strand stubbâle torbacka tvÀra vormâ vÀster...

Context Size 2:

  1. c g mycetophila illita freeman c g leptochilus fuscipes gusenleitner c g polypedilum luteum forsyth ...
  2. eres soojijn kΓ€ldeeh 3
  3. fÑÑdÑst eres soojijn nevala puoh kiőtoh kÀldeeh őoddÒmeh nisonij jyelgipÑllueennÒmjuÑvkku tÑppÑi taa...

Context Size 3:

  1. fÑÑdÑst eres soojijn kÀldeeh őoddÒmeh olmooővuoigÒdvuotÒpiÀluőteijeeh vyeitteeh vyeitteeh
  2. eres soojijn kΓ€ldeeh ovdiih kieldah siijdah
  3. ton vijΔ‘odΓ’h lii 76 66 km jΓ‘ alodΓ’h 777 m arquata del tronto naaburkieldah lÑÑ accumoli acquasanta t...

Context Size 4:

  1. fÑÑdÑst eres soojijn kÀldeeh 7
  2. tΓ€rhis peivimeeri ij tiΓ€Δ‘ust eennΓ’m tuΓ‘rgistij korrΓ’sΓ‘vt erzincanist tuurkist eennΓ’mtuΓ‘rgΓ‘stΓ’s inten...
  3. nuuvΓ’i juliaanlΓ’Ε‘ kalender mield lΓ‘vurduv tot lΓ’i kuuΔ‘Γ’d ihe tΓ‘bΓ‘htusah kuovΓ’mÑÑnu kuovΓ’mÑÑnu 5 peei...

Generated Text Samples (Subword-based)

Below are text samples generated from each subword-based Markov chain model:

Context Size 1:

  1. _pypovΓ’limivuonΓ’
  2. iiastreroorÑÑvej
  3. enussazd_m_airir

Context Size 2:

  1. i_19_58_ivi).saal
  2. ._kij_yorsimΓ‘id._
  3. stilÑÑstaal,_kuov

Context Size 3:

  1. mÑÑnu_7._skylÀ_jam
  2. Γ‘nu_vuotΓ’_reenny_v
  3. ÑÑnu_9._peeicinen,

Context Size 4:

  1. mÑÑnu_22._čohčÒmÑÑn
  2. ÑÑnu_25._vyesimÑÑnu
  3. Ñnu_52_sÀÀnis_njÀlm

Key Findings

  • Best Predictability: Context-4 (word) with 96.4% predictability
  • Branching Factor: Decreases with context size (more deterministic)
  • Memory Trade-off: Larger contexts require more storage (243,936 contexts)
  • Recommendation: Context-3 or Context-4 for text generation

4. Vocabulary Analysis

Zipf's Law

Top Words

Coverage Curve

Statistics

Metric Value
Vocabulary Size 56,543
Total Tokens 980,163
Mean Frequency 17.33
Median Frequency 3
Frequency Std Dev 192.38

Most Common Words

Rank Word Frequency
1 jΓ‘ 27,834
2 lii 16,486
3 ive 10,270
4 peeivi 7,716
5 the 7,233
6 lΓ’i 7,177
7 lÑÑ 6,710
8 kΓ€ldeeh 6,475
9 g 5,865
10 c 5,828

Least Common Words (from vocabulary)

Rank Word Frequency
1 kelemeny 2
2 animaatiorÑÑiΔ‘uh 2
3 Γ‘mΓ‘tteh 2
4 geΓ€vrrie 2
5 smiths 2
6 ringettest 2
7 moolΓ’vaavtΓ’in 2
8 gloucester 2
9 nuorttΓ’juΓ‘vkku 2
10 lovoiguin 2

Zipf's Law Analysis

Metric Value
Zipf Coefficient 0.9814
RΒ² (Goodness of Fit) 0.998205
Adherence Quality excellent

Coverage Analysis

Top N Words Coverage
Top 100 30.6%
Top 1,000 56.7%
Top 5,000 74.6%
Top 10,000 82.5%

Key Findings

  • Zipf Compliance: RΒ²=0.9982 indicates excellent adherence to Zipf's law
  • High Frequency Dominance: Top 100 words cover 30.6% of corpus
  • Long Tail: 46,543 words needed for remaining 17.5% coverage

5. Word Embeddings Evaluation

Embedding Isotropy

Similarity Matrix

t-SNE Words

t-SNE Sentences

5.1 Cross-Lingual Alignment

Alignment Quality

Multilingual t-SNE

5.2 Model Comparison

Model Dimension Isotropy Semantic Density Alignment R@1 Alignment R@10
mono_32d 32 0.8392 0.3414 N/A N/A
mono_64d 64 0.6621 0.2951 N/A N/A
mono_128d 128 0.2154 0.2973 N/A N/A
aligned_32d 32 0.8392 πŸ† 0.3374 0.0360 0.2520
aligned_64d 64 0.6621 0.3047 0.0580 0.3280
aligned_128d 128 0.2154 0.2807 0.0940 0.3760

Key Findings

  • Best Isotropy: aligned_32d with 0.8392 (more uniform distribution)
  • Semantic Density: Average pairwise similarity of 0.3094. Lower values indicate better semantic separation.
  • Alignment Quality: Aligned models achieve up to 9.4% R@1 in cross-lingual retrieval.
  • Recommendation: 128d aligned for best cross-lingual performance

6. Morphological Analysis (Experimental)

This section presents an automated morphological analysis derived from the statistical divergence between word-level and subword-level models. By analyzing where subword predictability spikes and where word-level coverage fails, we can infer linguistic structures without supervised data.

6.1 Productivity & Complexity

Metric Value Interpretation Recommendation
Productivity Index 5.000 High morphological productivity Reliable analysis
Idiomaticity Gap 0.195 Low formulaic content -

6.2 Affix Inventory (Productive Units)

These are the most productive prefixes and suffixes identified by sampling the vocabulary for global substitutability patterns. A unit is considered an affix if stripping it leaves a valid stem that appears in other contexts.

Productive Prefixes

Prefix Examples
-s saksofonist, soldiers, studente
-k kajanΓ’n, kirjetΓ‘rukielΓ’n, kirvesmies
-t tac, treat, tena
-p persialuovtΓ’, petri, puovttijn
-m myeongjong, mΓ‘inusist, manchester
-a attenuata, argonaut, acme
-l longobardlΓ’Ε‘, luΓ‘ndutile, lista
-r roovvÒdmÑÑnu, ruttÒdemeennÒm, ruttÒdmist

Productive Suffixes

Suffix Examples
-n kajanΓ’n, puovttijn, kirjetΓ‘rukielΓ’n
-i petri, peltoinlahti, ozi
-t saksofonist, mΓ‘inusist, ruttΓ’dmist
-st saksofonist, mΓ‘inusist, ruttΓ’dmist
-a nabda, bΓ₯tsmora, guerra
-s soldiers, neomys, ils
-e studente, courte, oovce
-h Àddejeh, vÀÀrialodÒh, underneath

6.3 Bound Stems (Lexical Roots)

Bound stems are high-frequency subword units that are semantically cohesive but rarely appear as standalone words. These often correspond to the 'core' of a word that requires inflection or derivation to be valid.

Stem Cohesion Substitutability Examples
ielΓ’ 1.89x 19 contexts Ε‘ielΓ’, kielΓ’, mielΓ’
ield 1.75x 22 contexts field, mield, mielde
kiel 1.63x 27 contexts kielΓ’, kiela, kieli
kirj 1.80x 17 contexts kirja, kirje, kirjed
kuΓ‘v 2.00x 12 contexts kuΓ‘vlu, kuΓ‘vΕΎur, kuΓ‘vsui
miel 1.82x 12 contexts mieli, mield, mielΓ’
kaav 1.81x 11 contexts kaavi, kaava, kaavio
staa 1.70x 13 contexts gstaad, staalu, staaΔ‘Γ’
llee 1.53x 16 contexts ellee, elleeh, lΓ€llee
vtΓ’s 1.65x 11 contexts laavtΓ’s, piivtΓ’s, oovtΓ’st
ijee 1.71x 9 contexts rΓ€ijee, leijee, saijeed
ovtΓ’ 1.71x 9 contexts ovtΓ’i, oovtΓ’, moovtΓ’

6.4 Affix Compatibility (Co-occurrence)

This table shows which prefixes and suffixes most frequently co-occur on the same stems, revealing the 'stacking' rules of the language's morphology.

Prefix Suffix Frequency Examples
-k -i 99 words koΔ‘oÀÀigi, kuorgΓ’i
-k -a 85 words klaipΔ—da, kerola
-s -n 80 words sΓΆderudden, superman
-p -n 76 words pin, palestiin
-k -n 74 words kaandΓ’in, kotimaisten
-m -i 69 words majniemi, muusiksyergi
-s -a 65 words selÀnoja, sigādtsiga
-m -n 63 words moiguin, mcpherson
-t -n 61 words torjuin, tiipΕ‘on
-k -t 60 words kertomukset, koirat

6.5 Recursive Morpheme Segmentation

Using Recursive Hierarchical Substitutability, we decompose complex words into their constituent morphemes. This approach handles nested affixes (e.g., prefix-prefix-root-suffix).

Word Suggested Split Confidence Stem
kunΓ’gΓ’liih kunΓ’gΓ’l-i-ih 7.5 i
sisaΕ‘ijminister sisaΕ‘ijmini-st-er 7.5 st
anthomyia anthomy-i-a 7.5 i
historjΓ‘liih historjΓ‘l-i-ih 7.5 i
miΓ€nΓ‘stus miΓ€nΓ‘-st-us 7.5 st
kieldΓ’listo kieldΓ’li-st-o 7.5 st
tuulosist tuulos-i-st 7.5 i
spiekΓ’steh spiekΓ’-st-eh 7.5 st
uΔ‘Δ‘Γ’ivemÑÑnuio uΔ‘Δ‘Γ’ivemÑÑnu-i-o 7.5 i
čuÑvumist čuÑvu-mi-st 7.5 mi
uΓ‘sΓ‘listeh uΓ‘sΓ‘li-st-eh 7.5 st
journalists journali-st-s 7.5 st
faithless faithle-s-s 7.5 s
leppΓ€ranta leppΓ€ra-n-ta 7.5 n
silbΓ’mitalistΓ’n silbΓ’mitali-st-Γ’n 7.5 st

6.6 Linguistic Interpretation

Automated Insight: The language Inari Sami shows high morphological productivity. The subword models are significantly more efficient than word models, suggesting a rich system of affixation or compounding.


7. Summary & Recommendations

Performance Dashboard

Production Recommendations

Component Recommended Rationale
Tokenizer 64k BPE Best compression (4.51x)
N-gram 2-gram Lowest perplexity (438)
Markov Context-4 Highest predictability (96.4%)
Embeddings 100d Balanced semantic capture and isotropy

Appendix: Metrics Glossary & Interpretation Guide

This section provides definitions, intuitions, and guidance for interpreting the metrics used throughout this report.

Tokenizer Metrics

Compression Ratio

Definition: The ratio of characters to tokens (chars/token). Measures how efficiently the tokenizer represents text.

Intuition: Higher compression means fewer tokens needed to represent the same text, reducing sequence lengths for downstream models. A 3x compression means ~3 characters per token on average.

What to seek: Higher is generally better for efficiency, but extremely high compression may indicate overly aggressive merging that loses morphological information.

Average Token Length (Fertility)

Definition: Mean number of characters per token produced by the tokenizer.

Intuition: Reflects the granularity of tokenization. Longer tokens capture more context but may struggle with rare words; shorter tokens are more flexible but increase sequence length.

What to seek: Balance between 2-5 characters for most languages. Arabic/morphologically-rich languages may benefit from slightly longer tokens.

Unknown Token Rate (OOV Rate)

Definition: Percentage of tokens that map to the unknown/UNK token, indicating words the tokenizer cannot represent.

Intuition: Lower OOV means better vocabulary coverage. High OOV indicates the tokenizer encounters many unseen character sequences.

What to seek: Below 1% is excellent; below 5% is acceptable. BPE tokenizers typically achieve very low OOV due to subword fallback.

N-gram Model Metrics

Perplexity

Definition: Measures how "surprised" the model is by test data. Mathematically: 2^(cross-entropy). Lower values indicate better prediction.

Intuition: If perplexity is 100, the model is as uncertain as if choosing uniformly among 100 options at each step. A perplexity of 10 means effectively choosing among 10 equally likely options.

What to seek: Lower is better. Perplexity decreases with larger n-grams (more context). Values vary widely by language and corpus size.

Entropy

Definition: Average information content (in bits) needed to encode the next token given the context. Related to perplexity: perplexity = 2^entropy.

Intuition: High entropy means high uncertainty/randomness; low entropy means predictable patterns. Natural language typically has entropy between 1-4 bits per character.

What to seek: Lower entropy indicates more predictable text patterns. Entropy should decrease as n-gram size increases.

Coverage (Top-K)

Definition: Percentage of corpus occurrences explained by the top K most frequent n-grams.

Intuition: High coverage with few patterns indicates repetitive/formulaic text; low coverage suggests diverse vocabulary usage.

What to seek: Depends on use case. For language modeling, moderate coverage (40-60% with top-1000) is typical for natural text.

Markov Chain Metrics

Average Entropy

Definition: Mean entropy across all contexts, measuring average uncertainty in next-word prediction.

Intuition: Lower entropy means the model is more confident about what comes next. Context-1 has high entropy (many possible next words); Context-4 has low entropy (few likely continuations).

What to seek: Decreasing entropy with larger context sizes. Very low entropy (<0.1) indicates highly deterministic transitions.

Branching Factor

Definition: Average number of unique next tokens observed for each context.

Intuition: High branching = many possible continuations (flexible but uncertain); low branching = few options (predictable but potentially repetitive).

What to seek: Branching factor should decrease with context size. Values near 1.0 indicate nearly deterministic chains.

Predictability

Definition: Derived metric: (1 - normalized_entropy) Γ— 100%. Indicates how deterministic the model's predictions are.

Intuition: 100% predictability means the next word is always certain; 0% means completely random. Real text falls between these extremes.

What to seek: Higher predictability for text generation quality, but too high (>98%) may produce repetitive output.

Vocabulary & Zipf's Law Metrics

Zipf's Coefficient

Definition: The slope of the log-log plot of word frequency vs. rank. Zipf's law predicts this should be approximately -1.

Intuition: A coefficient near -1 indicates the corpus follows natural language patterns where a few words are very common and most words are rare.

What to seek: Values between -0.8 and -1.2 indicate healthy natural language distribution. Deviations may suggest domain-specific or artificial text.

RΒ² (Coefficient of Determination)

Definition: Measures how well the linear fit explains the frequency-rank relationship. Ranges from 0 to 1.

Intuition: RΒ² near 1.0 means the data closely follows Zipf's law; lower values indicate deviation from expected word frequency patterns.

What to seek: RΒ² > 0.95 is excellent; > 0.99 indicates near-perfect Zipf adherence typical of large natural corpora.

Vocabulary Coverage

Definition: Cumulative percentage of corpus tokens accounted for by the top N words.

Intuition: Shows how concentrated word usage is. If top-100 words cover 50% of text, the corpus relies heavily on common words.

What to seek: Top-100 covering 30-50% is typical. Higher coverage indicates more repetitive text; lower suggests richer vocabulary.

Word Embedding Metrics

Isotropy

Definition: Measures how uniformly distributed vectors are in the embedding space. Computed as the ratio of minimum to maximum singular values.

Intuition: High isotropy (near 1.0) means vectors spread evenly in all directions; low isotropy means vectors cluster in certain directions, reducing expressiveness.

What to seek: Higher isotropy generally indicates better-quality embeddings. Values > 0.1 are reasonable; > 0.3 is good. Lower-dimensional embeddings tend to have higher isotropy.

Average Norm

Definition: Mean magnitude (L2 norm) of word vectors in the embedding space.

Intuition: Indicates the typical "length" of vectors. Consistent norms suggest stable training; high variance may indicate some words are undertrained.

What to seek: Relatively consistent norms across models. The absolute value matters less than consistency (low std deviation).

Cosine Similarity

Definition: Measures angular similarity between vectors, ranging from -1 (opposite) to 1 (identical direction).

Intuition: Words with similar meanings should have high cosine similarity. This is the standard metric for semantic relatedness in embeddings.

What to seek: Semantically related words should score > 0.5; unrelated words should be near 0. Synonyms often score > 0.7.

t-SNE Visualization

Definition: t-Distributed Stochastic Neighbor Embedding - a dimensionality reduction technique that preserves local structure for visualization.

Intuition: Clusters in t-SNE plots indicate groups of semantically related words. Spread indicates vocabulary diversity; tight clusters suggest semantic coherence.

What to seek: Meaningful clusters (e.g., numbers together, verbs together). Avoid over-interpreting distances - t-SNE preserves local, not global, structure.

General Interpretation Guidelines

  1. Compare within model families: Metrics are most meaningful when comparing models of the same type (e.g., 8k vs 64k tokenizer).
  2. Consider trade-offs: Better performance on one metric often comes at the cost of another (e.g., compression vs. OOV rate).
  3. Context matters: Optimal values depend on downstream tasks. Text generation may prioritize different metrics than classification.
  4. Corpus influence: All metrics are influenced by corpus characteristics. Wikipedia text differs from social media or literature.
  5. Language-specific patterns: Morphologically rich languages (like Arabic) may show different optimal ranges than analytic languages.

Visualizations Index

Visualization Description
Tokenizer Compression Compression ratios by vocabulary size
Tokenizer Fertility Average token length by vocabulary
Tokenizer OOV Unknown token rates
Tokenizer Total Tokens Total tokens by vocabulary
N-gram Perplexity Perplexity by n-gram size
N-gram Entropy Entropy by n-gram size
N-gram Coverage Top pattern coverage
N-gram Unique Unique n-gram counts
Markov Entropy Entropy by context size
Markov Branching Branching factor by context
Markov Contexts Unique context counts
Zipf's Law Frequency-rank distribution with fit
Vocab Frequency Word frequency distribution
Top 20 Words Most frequent words
Vocab Coverage Cumulative coverage curve
Embedding Isotropy Vector space uniformity
Embedding Norms Vector magnitude distribution
Embedding Similarity Word similarity heatmap
Nearest Neighbors Similar words for key terms
t-SNE Words 2D word embedding visualization
t-SNE Sentences 2D sentence embedding visualization
Position Encoding Encoding method comparison
Model Sizes Storage requirements
Performance Dashboard Comprehensive performance overview

About This Project

Data Source

Models trained on wikipedia-monthly - a monthly snapshot of Wikipedia articles across 300+ languages.

Project

A project by Wikilangs - Open-source NLP models for every Wikipedia language.

Maintainer

Omar Kamali - Omneity Labs

Citation

If you use these models in your research, please cite:

@misc{wikilangs2025,
  author = {Kamali, Omar},
  title = {Wikilangs: Open NLP Models for Wikipedia Languages},
  year = {2025},
  doi = {10.5281/zenodo.18073153},
  publisher = {Zenodo},
  url = {https://huggingface.co/wikilangs}
  institution = {Omneity Labs}
}

License

MIT License - Free for academic and commercial use.

Links


Generated by Wikilangs Models Pipeline

Report Date: 2026-01-10 21:29:57

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Dataset used to train wikilangs/smn