language: sr
language_name: Serbian
language_family: slavic_south
tags:
- wikilangs
- nlp
- tokenizer
- embeddings
- n-gram
- markov
- wikipedia
- feature-extraction
- sentence-similarity
- tokenization
- n-grams
- markov-chain
- text-mining
- fasttext
- babelvec
- vocabulous
- vocabulary
- monolingual
- family-slavic_south
license: mit
library_name: wikilangs
pipeline_tag: text-generation
datasets:
- omarkamali/wikipedia-monthly
dataset_info:
name: wikipedia-monthly
description: Monthly snapshots of Wikipedia articles across 300+ languages
metrics:
- name: best_compression_ratio
type: compression
value: 4.463
- name: best_isotropy
type: isotropy
value: 0.7304
- name: vocabulary_size
type: vocab
value: 0
generated: 2026-01-11T00:00:00.000Z
Serbian - Wikilangs Models
Comprehensive Research Report & Full Ablation Study
This repository contains NLP models trained and evaluated by Wikilangs, specifically on Serbian Wikipedia data. We analyze tokenizers, n-gram models, Markov chains, vocabulary statistics, and word embeddings.
📋 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 | 3.437x | 3.44 | 0.0903% | 3,193,783 |
| 16k | 3.819x | 3.82 | 0.1004% | 2,874,429 |
| 32k | 4.168x | 4.17 | 0.1095% | 2,633,814 |
| 64k | 4.463x 🏆 | 4.46 | 0.1173% | 2,459,404 |
Tokenization Examples
Below are sample sentences tokenized with each vocabulary size:
Sample 1: Сабо () је веома често мађарско презиме као на пример код Срба Јовановић, Николи...
| Vocab | Tokens | Count |
|---|---|---|
| 8k | ▁сабо ▁() ▁је ▁веома ▁често ▁мађар ско ▁презиме ▁као ▁на ... (+22 more) |
32 |
| 16k | ▁сабо ▁() ▁је ▁веома ▁често ▁мађарско ▁презиме ▁као ▁на ▁пример ... (+17 more) |
27 |
| 32k | ▁сабо ▁() ▁је ▁веома ▁често ▁мађарско ▁презиме ▁као ▁на ▁пример ... (+17 more) |
27 |
| 64k | ▁сабо ▁() ▁је ▁веома ▁често ▁мађарско ▁презиме ▁као ▁на ▁пример ... (+17 more) |
27 |
Sample 2: Еребус се може односити на: Еребус, божанство из грчке митологије планину на Ант...
| Vocab | Tokens | Count |
|---|---|---|
| 8k | ▁ере бу с ▁се ▁може ▁односити ▁на : ▁ере бу ... (+29 more) |
39 |
| 16k | ▁ере бус ▁се ▁може ▁односити ▁на : ▁ере бус , ... (+22 more) |
32 |
| 32k | ▁ере бус ▁се ▁може ▁односити ▁на : ▁ере бус , ... (+17 more) |
27 |
| 64k | ▁ере бус ▁се ▁може ▁односити ▁на : ▁ере бус , ... (+17 more) |
27 |
Sample 3: Ово је страница за вишезначну одредницу појма Лимбо. Лимбо (програмски језик) Ли...
| Vocab | Tokens | Count |
|---|---|---|
| 8k | ▁ово ▁је ▁страница ▁за ▁више зна чну ▁одре дни цу ... (+27 more) |
37 |
| 16k | ▁ово ▁је ▁страница ▁за ▁више зна чну ▁одре дни цу ... (+26 more) |
36 |
| 32k | ▁ово ▁је ▁страница ▁за ▁више зна чну ▁одре дницу ▁појма ... (+22 more) |
32 |
| 64k | ▁ово ▁је ▁страница ▁за ▁вишезна чну ▁одре дницу ▁појма ▁лимбо ... (+15 more) |
25 |
Key Findings
- Best Compression: 64k achieves 4.463x compression
- Lowest UNK Rate: 8k with 0.0903% 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 | 101,010 | 16.62 | 541,740 | 10.5% | 23.1% |
| 2-gram | Subword | 417 🏆 | 8.70 | 10,655 | 57.4% | 97.8% |
| 3-gram | Word | 173,243 | 17.40 | 753,336 | 12.1% | 19.9% |
| 3-gram | Subword | 3,794 | 11.89 | 91,805 | 20.7% | 60.8% |
| 4-gram | Word | 303,317 | 18.21 | 1,236,985 | 12.9% | 18.9% |
| 4-gram | Subword | 23,753 | 14.54 | 568,494 | 8.7% | 30.0% |
| 5-gram | Word | 175,057 | 17.42 | 859,857 | 15.7% | 23.0% |
| 5-gram | Subword | 103,293 | 16.66 | 1,934,363 | 4.2% | 16.6% |
Top 5 N-grams by Size
2-grams (Word):
| Rank | N-gram | Count |
|---|---|---|
| 1 | да се |
37,569 |
| 2 | да је |
37,093 |
| 3 | који је |
32,864 |
| 4 | је у |
32,694 |
| 5 | у француској |
28,666 |
3-grams (Word):
| Rank | N-gram | Count |
|---|---|---|
| 1 | референце спољашње везе |
17,332 |
| 2 | географија насеља у |
14,556 |
| 3 | из године у |
12,667 |
| 4 | подацима из године |
12,386 |
| 5 | по подацима из |
12,385 |
4-grams (Word):
| Rank | N-gram | Count |
|---|---|---|
| 1 | географија насеља у француској |
12,290 |
| 2 | у француској географија насеља |
12,231 |
| 3 | француској географија насеља у |
12,231 |
| 4 | по подацима из године |
12,218 |
| 5 | у општини је живело |
12,073 |
5-grams (Word):
| Rank | N-gram | Count |
|---|---|---|
| 1 | француској географија насеља у француској |
12,231 |
| 2 | у француској географија насеља у |
12,231 |
| 3 | а густина насељености је износила |
12,019 |
| 4 | године у општини је живело |
12,013 |
| 5 | по подацима из године у |
12,009 |
2-grams (Subword):
| Rank | N-gram | Count |
|---|---|---|
| 1 | а _ |
4,254,775 |
| 2 | е _ |
3,484,880 |
| 3 | и _ |
2,798,461 |
| 4 | _ с |
2,402,734 |
| 5 | _ п |
2,167,464 |
3-grams (Subword):
| Rank | N-gram | Count |
|---|---|---|
| 1 | ј е _ |
1,227,613 |
| 2 | _ ј е |
1,007,997 |
| 3 | _ н а |
904,776 |
| 4 | _ п о |
898,886 |
| 5 | н а _ |
849,756 |
4-grams (Subword):
| Rank | N-gram | Count |
|---|---|---|
| 1 | _ ј е _ |
832,365 |
| 2 | _ н а _ |
351,709 |
| 3 | _ с е _ |
341,716 |
| 4 | , _ - { |
333,041 |
| 5 | _ с у _ |
265,965 |
5-grams (Subword):
| Rank | N-gram | Count |
|---|---|---|
| 1 | а _ ј е _ |
233,666 |
| 2 | _ г о д и |
196,626 |
| 3 | г о д и н |
193,637 |
| 4 | о _ ј е _ |
179,487 |
| 5 | о д и н е |
149,943 |
Key Findings
- Best Perplexity: 2-gram (subword) with 417
- Entropy Trend: Decreases with larger n-grams (more predictable)
- Coverage: Top-1000 patterns cover ~17% 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 | 1.0281 | 2.039 | 9.57 | 1,005,421 | 0.0% |
| 1 | Subword | 0.9082 | 1.877 | 7.42 | 4,016 | 9.2% |
| 2 | Word | 0.2993 | 1.231 | 1.87 | 9,615,248 | 70.1% |
| 2 | Subword | 0.9001 | 1.866 | 6.18 | 29,746 | 10.0% |
| 3 | Word | 0.1002 | 1.072 | 1.20 | 17,985,483 | 90.0% |
| 3 | Subword | 0.8701 | 1.828 | 4.99 | 183,681 | 13.0% |
| 4 | Word | 0.0325 🏆 | 1.023 | 1.05 | 21,482,040 | 96.7% |
| 4 | Subword | 0.7815 | 1.719 | 3.70 | 916,341 | 21.8% |
Generated Text Samples (Word-based)
Below are text samples generated from each word-based Markov chain model:
Context Size 1:
је само састављали збирке одељења за члана председништва цк кпј у уметничко друштво је русија јеу овом делу sidereus nuncius године националност срби плаћали променила велики рептили који вређа кр...и најавни део провансе и након што су поставили војску је 404 метара максималној 634 године
Context Size 2:
да се никада не напушта ни наду децу треба научити до 6 маја по црквеном а 6да је основна обрада добро изведена и претежно сува са највећим избором литературе са исказима свјед...који је стекао и велики број лоше васпитане деце из брака са марином севером и игра финале
Context Size 3:
референце спољашње везе база података insee арбукав на страници националног географског института фр...географија насеља у француској север у француској географија насеља у француској мозел у француској ...из године у општини је живело 41 становника а густина насељености је износила 37 47 општина се прост...
Context Size 4:
француској географија насеља у француској аверон у француској географија насеља у француској север у...у француској географија насеља у француској алије у француској географија насеља у француској арјеж ...по подацима из године у општини је живело становника а густина насељености је износила 148 84 општин...
Generated Text Samples (Subword-based)
Below are text samples generated from each subword-based Markov chain model:
Context Size 1:
_хе_фенсјутравата_рин-{cetote,_си,_ка_овезе_е_".
Context Size 2:
а_18._евојмаљивине_се_дембрановод_и_мрепрата_и_ствр
Context Size 3:
је_у_бела_милазе_м_је_(трна_тесаветс_на_са_редињени_од
Context Size 4:
_је_насељености_чиј_на_светом,_и_мишље_се_раку.потребљено
Key Findings
- Best Predictability: Context-4 (word) with 96.7% predictability
- Branching Factor: Decreases with context size (more deterministic)
- Memory Trade-off: Larger contexts require more storage (916,341 contexts)
- Recommendation: Context-3 or Context-4 for text generation
4. Vocabulary Analysis
Statistics
| Metric | Value |
|---|---|
| Vocabulary Size | 517,888 |
| Total Tokens | 24,596,294 |
| Mean Frequency | 47.49 |
| Median Frequency | 4 |
| Frequency Std Dev | 2239.63 |
Most Common Words
| Rank | Word | Frequency |
|---|---|---|
| 1 | је | 841,603 |
| 2 | у | 779,149 |
| 3 | и | 778,274 |
| 4 | на | 355,146 |
| 5 | се | 345,085 |
| 6 | су | 272,433 |
| 7 | да | 243,646 |
| 8 | од | 217,292 |
| 9 | за | 179,897 |
| 10 | са | 153,021 |
Least Common Words (from vocabulary)
| Rank | Word | Frequency |
|---|---|---|
| 1 | astropixels | 2 |
| 2 | astron | 2 |
| 3 | periodicities | 2 |
| 4 | tjeenk | 2 |
| 5 | morsels | 2 |
| 6 | heatseekers | 2 |
| 7 | млађака | 2 |
| 8 | espenak | 2 |
| 9 | пба | 2 |
| 10 | пбка | 2 |
Zipf's Law Analysis
| Metric | Value |
|---|---|
| Zipf Coefficient | 0.9204 |
| R² (Goodness of Fit) | 0.998749 |
| Adherence Quality | excellent |
Coverage Analysis
| Top N Words | Coverage |
|---|---|
| Top 100 | 29.3% |
| Top 1,000 | 48.4% |
| Top 5,000 | 64.3% |
| Top 10,000 | 71.6% |
Key Findings
- Zipf Compliance: R²=0.9987 indicates excellent adherence to Zipf's law
- High Frequency Dominance: Top 100 words cover 29.3% of corpus
- Long Tail: 507,888 words needed for remaining 28.4% 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 | 0.7304 | 0.4041 | N/A | N/A |
| mono_64d | 64 | 0.6931 | 0.3311 | N/A | N/A |
| mono_128d | 128 | 0.6524 | 0.2382 | N/A | N/A |
| aligned_32d | 32 | 0.7304 🏆 | 0.4084 | 0.0400 | 0.2700 |
| aligned_64d | 64 | 0.6931 | 0.3210 | 0.1200 | 0.4240 |
| aligned_128d | 128 | 0.6524 | 0.2421 | 0.1280 | 0.4500 |
Key Findings
- Best Isotropy: aligned_32d with 0.7304 (more uniform distribution)
- Semantic Density: Average pairwise similarity of 0.3242. Lower values indicate better semantic separation.
- Alignment Quality: Aligned models achieve up to 12.8% 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 | 0.390 | 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 |
|---|---|
-s |
schiffer, slotove, saposchnikowii |
-с |
сеља, сажела, социјалиста |
-a |
amonijak, abnormal, amundsen |
-к |
корисника, квасци, конвективну |
-а |
анализатори, алентаун, атеници |
-ма |
марашли, мауретаније, маленченко |
-по |
поморишки, подстрекивани, покајањем |
-b |
base, berlencourt, bessins |
Productive Suffixes
| Suffix | Examples |
|---|---|
-а |
екосистемска, дикава, пауза |
-s |
entomopisthius, walkers, knottnerus |
-a |
taeniifera, jouvea, pillaia |
-и |
марашли, темперовани, анализатори |
-е |
пасуљанске, ларе, мауретаније |
-us |
entomopisthius, knottnerus, ovigerus |
-м |
деутеријумом, фруктозом, истакнутим |
-у |
упу, досежу, бубну |
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 |
|---|---|---|---|
ости |
1.98x | 208 contexts | рости, аости, остин |
ском |
2.03x | 155 contexts | уском, еском, воском |
ност |
2.07x | 99 contexts | ностра, ностер, иностр |
анск |
1.44x | 640 contexts | данск, канск, јански |
нски |
1.73x | 187 contexts | јански, шонски, сенски |
асељ |
2.49x | 36 contexts | насељу, насеље, засеље |
општ |
1.98x | 83 contexts | опште, општу, општи |
држа |
1.66x | 187 contexts | држао, држач, одржа |
егов |
1.78x | 120 contexts | његов, негов, бегов |
ациј |
1.66x | 153 contexts | лациј, ација, нације |
пшти |
2.16x | 38 contexts | општи, уопшти, општио |
ориј |
1.50x | 191 contexts | орија, морији, морије |
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 |
|---|---|---|---|
-с |
-а |
93 words | светила, сенахирима |
-a |
-s |
89 words | avidus, abiskoensis |
-к |
-а |
84 words | капитализација, краварица |
-s |
-s |
79 words | spretus, synechogobius |
-a |
-a |
61 words | albopicta, anamaera |
-с |
-и |
56 words | сокобањи, сасечени |
-с |
-е |
54 words | стручне, смртнице |
-а |
-а |
52 words | ангажманима, астрофизичка |
-с |
-м |
51 words | сопством, севиљском |
-к |
-и |
49 words | касноантички, карантанији |
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 |
|---|---|---|---|
| електрана | електр-а-на |
7.5 | а |
| одгурнути | одгурн-у-ти |
7.5 | у |
| областимаи | области-ма-и |
7.5 | ма |
| оправдани | оправд-а-ни |
7.5 | а |
| меканском | ме-канск-ом |
6.0 | канск |
| поштовану | пошто-ва-ну |
6.0 | пошто |
| јованкину | јован-ки-ну |
6.0 | јован |
| коминикеи | комини-ке-и |
6.0 | комини |
| проживети | пр-оживе-ти |
6.0 | оживе |
| катаринин | катари-ни-н |
6.0 | катари |
| примењену | приме-ње-ну |
6.0 | приме |
| фосфолипида | фосфолипид-а |
4.5 | фосфолипид |
| зеведејева | зеведејев-а |
4.5 | зеведејев |
| радиоактивности | радиоактивност-и |
4.5 | радиоактивност |
| скорпиона | скорпион-а |
4.5 | скорпион |
6.6 Linguistic Interpretation
Automated Insight: The language Serbian 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 | 64k BPE | Best compression (4.46x) |
| N-gram | 2-gram | Lowest perplexity (417) |
| Markov | Context-4 | Highest predictability (96.7%) |
| 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) × 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.
R² (Coefficient of Determination)
Definition: Measures how well the linear fit explains the frequency-rank relationship. Ranges from 0 to 1.
Intuition: R² near 1.0 means the data closely follows Zipf's law; lower values indicate deviation from expected word frequency patterns.
What to seek: R² > 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
- 🌐 Website: wikilangs.org
- 🤗 Models: huggingface.co/wikilangs
- 📊 Data: wikipedia-monthly
- 👤 Author: Omar Kamali
- 🤝 Sponsor: Featherless AI
Generated by Wikilangs Models Pipeline
Report Date: 2026-01-11 00:46:21



















