Atikamekw - Wikilangs Models
Comprehensive Research Report & Full Ablation Study
This repository contains NLP models trained and evaluated by Wikilangs, specifically on Atikamekw Wikipedia data. We analyze tokenizers, n-gram models, Markov chains, vocabulary statistics, and word embeddings.
π 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
Analysis and Evaluation
- 1. Tokenizer Evaluation
- 2. N-gram Model Evaluation
- 3. Markov Chain Evaluation
- 4. Vocabulary Analysis
- 5. Word Embeddings Evaluation
- 6. Morphological Analysis (Experimental)
- 7. Summary & Recommendations
- Metrics Glossary
- Visualizations Index
1. Tokenizer Evaluation
Results
| Vocab Size | Compression | Avg Token Len | UNK Rate | Total Tokens |
|---|---|---|---|---|
| 8k | 5.122x | 5.13 | 0.1886% | 91,751 |
| 16k | 5.512x | 5.52 | 0.2029% | 85,261 |
| 32k | 5.953x π | 5.97 | 0.2191% | 78,943 |
Tokenization Examples
Below are sample sentences tokenized with each vocabulary size:
Sample 1: Sainte-Anne-des-Monts oteno Kepek askik ici actew, Kanata. Irikik e tacinaniwok ...
| Vocab | Tokens | Count |
|---|---|---|
| 8k | βsainte - anne - des - mont s βoteno βkepek ... (+16 more) |
26 |
| 16k | βsainte - anne - des - monts βoteno βkepek βaskik ... (+15 more) |
25 |
| 32k | βsainte - anne - des - monts βoteno βkepek βaskik ... (+15 more) |
25 |
Sample 2: Mulgrave oteno Nouvelle-Γcosse aski ici actew, Kanata. Irikik e tacinaniwok 879 ...
| Vocab | Tokens | Count |
|---|---|---|
| 8k | βm ul gra ve βoteno βnouvelle - Γ©cosse βaski βici ... (+12 more) |
22 |
| 16k | βmulgrave βoteno βnouvelle - Γ©cosse βaski βici βactew , βkanata ... (+9 more) |
19 |
| 32k | βmulgrave βoteno βnouvelle - Γ©cosse βaski βici βactew , βkanata ... (+9 more) |
19 |
Sample 3: Gracefield oteno Kepek askik ici actew, Kanata. Irikik e tacinaniwok 2 462 matce...
| Vocab | Tokens | Count |
|---|---|---|
| 8k | βgra ce field βoteno βkepek βaskik βici βactew , βkanata ... (+11 more) |
21 |
| 16k | βgra ce field βoteno βkepek βaskik βici βactew , βkanata ... (+11 more) |
21 |
| 32k | βgracefield βoteno βkepek βaskik βici βactew , βkanata . βirikik ... (+9 more) |
19 |
Key Findings
- Best Compression: 32k achieves 5.953x compression
- Lowest UNK Rate: 8k with 0.1886% 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
Results
| N-gram | Variant | Perplexity | Entropy | Unique N-grams | Top-100 Coverage | Top-1000 Coverage |
|---|---|---|---|---|---|---|
| 2-gram | Word | 755 | 9.56 | 2,021 | 44.7% | 84.2% |
| 2-gram | Subword | 129 π | 7.01 | 987 | 89.0% | 100.0% |
| 3-gram | Word | 540 | 9.08 | 1,854 | 50.0% | 84.6% |
| 3-gram | Subword | 759 | 9.57 | 5,467 | 41.9% | 92.6% |
| 4-gram | Word | 584 | 9.19 | 2,555 | 50.3% | 75.4% |
| 4-gram | Subword | 3,031 | 11.57 | 19,166 | 21.7% | 66.0% |
| 5-gram | Word | 345 | 8.43 | 1,658 | 58.1% | 85.5% |
| 5-gram | Subword | 7,892 | 12.95 | 37,893 | 14.8% | 46.5% |
Top 5 N-grams by Size
2-grams (Word):
| Rank | N-gram | Count |
|---|---|---|
| 1 | ici actew |
888 |
| 2 | actew kanata |
771 |
| 3 | manawan wemotaci |
721 |
| 4 | e ici |
685 |
| 5 | irikik e |
672 |
3-grams (Word):
| Rank | N-gram | Count |
|---|---|---|
| 1 | ici actew kanata |
770 |
| 2 | irikik e tacinaniwok |
633 |
| 3 | kanata irikik e |
620 |
| 4 | actew kanata irikik |
620 |
| 5 | askik ici actew |
500 |
4-grams (Word):
| Rank | N-gram | Count |
|---|---|---|
| 1 | kanata irikik e tacinaniwok |
620 |
| 2 | actew kanata irikik e |
620 |
| 3 | ici actew kanata irikik |
620 |
| 4 | askik ici actew kanata |
490 |
| 5 | kepek askik ici actew |
457 |
5-grams (Word):
| Rank | N-gram | Count |
|---|---|---|
| 1 | ici actew kanata irikik e |
620 |
| 2 | actew kanata irikik e tacinaniwok |
620 |
| 3 | kepek askik ici actew kanata |
455 |
| 4 | askik ici actew kanata irikik |
358 |
| 5 | oteno kepek askik ici actew |
326 |
2-grams (Subword):
| Rank | N-gram | Count |
|---|---|---|
| 1 | c i |
23,681 |
| 2 | k a |
23,540 |
| 3 | _ k |
23,289 |
| 4 | t c |
23,201 |
| 5 | i k |
21,032 |
3-grams (Subword):
| Rank | N-gram | Count |
|---|---|---|
| 1 | t c i |
11,312 |
| 2 | _ k i |
10,113 |
| 3 | i t c |
10,005 |
| 4 | _ k a |
9,180 |
| 5 | c i _ |
8,655 |
4-grams (Subword):
| Rank | N-gram | Count |
|---|---|---|
| 1 | i t c i |
5,891 |
| 2 | a n i w |
5,154 |
| 3 | _ k a _ |
4,777 |
| 4 | n i w o |
4,372 |
| 5 | k a n i |
4,233 |
5-grams (Subword):
| Rank | N-gram | Count |
|---|---|---|
| 1 | a n i w o |
3,980 |
| 2 | n i w o k |
3,620 |
| 3 | k a n i w |
3,557 |
| 4 | a k a n i |
3,262 |
| 5 | _ m a t c |
2,919 |
Key Findings
- Best Perplexity: 2-gram (subword) with 129
- Entropy Trend: Decreases with larger n-grams (more predictable)
- Coverage: Top-1000 patterns cover ~47% of corpus
- Recommendation: 4-gram or 5-gram for best predictive performance
3. Markov Chain Evaluation
Results
| Context | Variant | Avg Entropy | Perplexity | Branching Factor | Unique Contexts | Predictability |
|---|---|---|---|---|---|---|
| 1 | Word | 0.5828 | 1.498 | 3.55 | 19,248 | 41.7% |
| 1 | Subword | 1.5433 | 2.915 | 13.86 | 118 | 0.0% |
| 2 | Word | 0.1881 | 1.139 | 1.41 | 67,567 | 81.2% |
| 2 | Subword | 1.2598 | 2.395 | 6.30 | 1,635 | 0.0% |
| 3 | Word | 0.0530 | 1.037 | 1.09 | 93,703 | 94.7% |
| 3 | Subword | 0.7971 | 1.738 | 3.30 | 10,279 | 20.3% |
| 4 | Word | 0.0146 π | 1.010 | 1.02 | 99,898 | 98.5% |
| 4 | Subword | 0.5503 | 1.464 | 2.26 | 33,860 | 45.0% |
Generated Text Samples (Word-based)
Below are text samples generated from each word-based Markov chain model:
Context Size 1:
e totcikatek arimatc aric kirowe warowik e iti matce tipaskonikik ka tato piponikarik awik e kitotcka takocinokopanen 22 otatakon pisimw nac mocak ki tesinikew kaie e tacinaniwok 352 395 matcectakani...ki pe ocitakaniwoki mikiwama ki ponimatisirikopon marianne ki kicikateriw kitci matcihitisotc nehiro...
Context Size 2:
ici actew kanata irikik e tacinaniwok 53 939 matcectakaniwokactew kanata irikik e tacinaniwok 10 051 matcectakaniwokmanawan wemotaci patak apitisiw anihe kirowe ka atiparik kecpin e orowinaniwok pitakamik e tacikaniw...
Context Size 3:
ici actew kanata irikik e tacinaniwok 20 161 e ici tipatcimomakak nicw takon anohwe nehiro oteno ket...kanata irikik e tacinaniwok 10 051 matcectakaniwokactew kanata irikik e tacinaniwok 2 216 matcectakaniwok
Context Size 4:
actew kanata irikik e tacinaniwok 7 347 matcectakaniwokici actew kanata irikik e tacinaniwok 7 282 matcectakaniwokkanata irikik e tacinaniwok 973 matcectakaniwok
Generated Text Samples (Subword-based)
Below are text samples generated from each subword-based Markov chain model:
Context Size 1:
iwoka_di_naw_k_m_m._ki_nanew._kaatcotakie_ak,_ac
Context Size 2:
cina._tacimoodre_kaniniwee_icitci__ki_ek_itcik._mot
Context Size 3:
tcik._matcectapwat_ki_icitc_kitc_agaitciwok._kaie_nta_
Context Size 4:
itcisowapinaniwiw_kaniwonik_meka_ki_oc_ka_tatopiponen_nip
Key Findings
- Best Predictability: Context-4 (word) with 98.5% predictability
- Branching Factor: Decreases with context size (more deterministic)
- Memory Trade-off: Larger contexts require more storage (33,860 contexts)
- Recommendation: Context-3 or Context-4 for text generation
4. Vocabulary Analysis
Statistics
| Metric | Value |
|---|---|
| Vocabulary Size | 6,458 |
| Total Tokens | 105,050 |
| Mean Frequency | 16.27 |
| Median Frequency | 3 |
| Frequency Std Dev | 131.25 |
Most Common Words
| Rank | Word | Frequency |
|---|---|---|
| 1 | e | 6,358 |
| 2 | ka | 4,817 |
| 3 | ki | 3,659 |
| 4 | ici | 2,655 |
| 5 | kitci | 1,874 |
| 6 | kaie | 1,655 |
| 7 | matcectakaniwok | 1,604 |
| 8 | micta | 1,222 |
| 9 | kirika | 1,111 |
| 10 | manawan | 972 |
Least Common Words (from vocabulary)
| Rank | Word | Frequency |
|---|---|---|
| 1 | nehirosi | 2 |
| 2 | cikomewokw | 2 |
| 3 | miitaw | 2 |
| 4 | droits | 2 |
| 5 | kiskinohamato | 2 |
| 6 | banque | 2 |
| 7 | mawotcicorianionik | 2 |
| 8 | fraser | 2 |
| 9 | otatisokaniwak | 2 |
| 10 | secwepemctsin | 2 |
Zipf's Law Analysis
| Metric | Value |
|---|---|
| Zipf Coefficient | 1.0505 |
| RΒ² (Goodness of Fit) | 0.987789 |
| Adherence Quality | excellent |
Coverage Analysis
| Top N Words | Coverage |
|---|---|
| Top 100 | 54.6% |
| Top 1,000 | 81.8% |
| Top 5,000 | 97.2% |
| Top 10,000 | 0.0% |
Key Findings
- Zipf Compliance: RΒ²=0.9878 indicates excellent adherence to Zipf's law
- High Frequency Dominance: Top 100 words cover 54.6% of corpus
- Long Tail: -3,542 words needed for remaining 100.0% coverage
5. Word Embeddings Evaluation
5.1 Cross-Lingual Alignment
5.2 Model Comparison
| Model | Dimension | Isotropy | Semantic Density | Alignment R@1 | Alignment R@10 |
|---|---|---|---|---|---|
| mono_32d | 32 | 0.1437 π | 0.4915 | N/A | N/A |
| mono_64d | 64 | 0.0311 | 0.5012 | N/A | N/A |
| mono_128d | 128 | 0.0055 | 0.4973 | N/A | N/A |
| aligned_32d | 32 | 0.1437 | 0.4825 | 0.0091 | 0.1088 |
| aligned_64d | 64 | 0.0311 | 0.5079 | 0.0136 | 0.1066 |
| aligned_128d | 128 | 0.0055 | 0.4960 | 0.0317 | 0.1565 |
Key Findings
- Best Isotropy: mono_32d with 0.1437 (more uniform distribution)
- Semantic Density: Average pairwise similarity of 0.4961. Lower values indicate better semantic separation.
- Alignment Quality: Aligned models achieve up to 3.2% 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 | 4.183 | High morphological productivity | Reliable analysis |
| Idiomaticity Gap | 0.838 | High formulaic/idiomatic 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 |
|---|---|
-ki |
kitciki, kimosapitc, kinowapitamokw |
-mi |
mireritamiriwa, mitciso, mirokiw |
-ma |
maninikatew, matcectakaniwok, mars |
-ot |
ototokon, otenocic, otenawa |
-ni |
nitowakik, nikomesak, nitawikiritci |
-ic |
icikapowiw, icinikatikik, icinkatew |
-wi |
wirino, witamotcik, wirtip |
-ta |
takociretc, tacikeriwa, taritci |
Productive Suffixes
| Suffix | Examples |
|---|---|
-k |
titopiponikak, kanawapitcikatek, nitowakik |
-w |
pakonehohakiniwiw, kinowapitamokw, nipiriw |
-c |
kimosapitc, ponihatc, pamatisitc |
-n |
ototokon, owen, foundation |
-ik |
nitowakik, witamotcik, totowakaniwitcik |
-tc |
kimosapitc, ponihatc, pamatisitc |
-ok |
itakiniwok, ntokihitisohok, nakapewonok |
-iw |
pakonehohakiniwiw, nipiriw, mowakiniwiw |
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 |
|---|---|---|---|
tako |
1.33x | 29 contexts | takok, takon, takoke |
taka |
1.42x | 22 contexts | pataka, otakai, otakaci |
mitc |
1.35x | 22 contexts | mitci, mitca, mitcim |
erit |
1.54x | 14 contexts | wewerita, oreritam, iteritci |
apit |
1.44x | 17 contexts | apita, tapit, apitc |
aniw |
1.36x | 19 contexts | aniwe, kaniwok, nikaniw |
iwok |
1.42x | 16 contexts | apiwok, irniwok, askiwok |
niwo |
1.50x | 13 contexts | irniwok, koniwok, kaniwok |
kana |
1.36x | 15 contexts | kanapΓ©, kanada, oskana |
irow |
1.51x | 11 contexts | kirowe, kewirow, wirowaw |
itak |
1.35x | 15 contexts | witak, titak, kitaki |
kate |
1.32x | 16 contexts | katek, makate, kateri |
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 |
|---|---|---|---|
-ki |
-k |
127 words | kiceriniwok, kinokepitcikanik |
-mi |
-k |
89 words | mirwacinik, mictikok |
-ma |
-k |
89 words | matakanik, matcikonak |
-ki |
-w |
68 words | kicteritakoniw, kiskinohamakew |
-mi |
-w |
65 words | mitcetaw, micaw |
-ni |
-k |
60 words | nikickowatcik, nikapewnok |
-ot |
-k |
57 words | ototewok, otcikowik |
-ki |
-ik |
56 words | kinokepitcikanik, kickapiskarik |
-ki |
-c |
51 words | kinikositc, kictapeitc |
-ta |
-k |
49 words | tarasak, tacikaniwonik |
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 |
|---|---|---|---|
| otaskitcik | ot-aski-tc-ik |
7.5 | aski |
| wikiconvention | wi-ki-convention |
6.0 | convention |
| nehirowisitcik | nehirowisi-tc-ik |
6.0 | nehirowisi |
| kiskerimakaniwiw | ki-skerimak-an-iw-iw |
6.0 | skerimak |
| takapikenikaniw | ta-kapiken-ik-an-iw |
6.0 | kapiken |
| wicamakaniwiw | wi-camak-an-iw-iw |
6.0 | camak |
| nikickotatotcik | ni-ki-ckotato-tc-ik |
6.0 | ckotato |
| kackihotcik | kackiho-tc-ik |
6.0 | kackiho |
| tipatcimotcik | tipatcimo-tc-ik |
6.0 | tipatcimo |
| takociretcik | ta-kocire-tc-ik |
4.5 | kocire |
| apatcihakaniwiw | apatcihak-an-iw-iw |
4.5 | apatcihak |
| takocinitcik | ta-kocini-tc-ik |
4.5 | kocini |
| kicowekaniw | ki-cowek-an-iw |
4.5 | cowek |
| emitcikocimotc | emitcikocimo-tc |
4.5 | emitcikocimo |
| apitcihakaniwiw | apitcihak-an-iw-iw |
4.5 | apitcihak |
6.6 Linguistic Interpretation
Automated Insight: The language Atikamekw shows high morphological productivity. The subword models are significantly more efficient than word models, suggesting a rich system of affixation or compounding.
Note on Idiomaticity: The high Idiomaticity Gap suggests a large number of frequent multi-word expressions or formulaic sequences that are statistically distinct from their component parts.
7. Summary & Recommendations
Production Recommendations
| Component | Recommended | Rationale |
|---|---|---|
| Tokenizer | 32k BPE | Best compression (5.95x) |
| N-gram | 2-gram | Lowest perplexity (129) |
| Markov | Context-4 | Highest predictability (98.5%) |
| 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
- Compare within model families: Metrics are most meaningful when comparing models of the same type (e.g., 8k vs 64k tokenizer).
- Consider trade-offs: Better performance on one metric often comes at the cost of another (e.g., compression vs. OOV rate).
- Context matters: Optimal values depend on downstream tasks. Text generation may prioritize different metrics than classification.
- Corpus influence: All metrics are influenced by corpus characteristics. Wikipedia text differs from social media or literature.
- 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
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
- π Website: wikilangs.org
- π€ Models: huggingface.co/wikilangs
- π Data: wikipedia-monthly
- π€ Author: Omar Kamali
- π€ Sponsor: Featherless AI
Generated by Wikilangs Models Pipeline
Report Date: 2026-01-03 17:35:34



















