Chess Challenge submission by KHOUTAIBI

README.md

@@ -0,0 +1,26 @@
+---
+library_name: transformers
+tags:
+- chess
+- llm-course
+- chess-challenge
+license: mit
+---
+
+# chess-model-KHOUTAIBI_v2
+
+Chess model submitted to the LLM Course Chess Challenge.
+
+## Submission Info
+
+- **Submitted by**: [KHOUTAIBI](https://huggingface.co/KHOUTAIBI)
+- **Parameters**: 485,376
+- **Organization**: LLM-course
+
+## Model Details
+
+- **Architecture**: Chess Transformer (GPT-style)
+- **Vocab size**: 1682
+- **Embedding dim**: 96
+- **Layers**: 4
+- **Heads**: 4

config.json

@@ -0,0 +1,21 @@
+{
+  "_name_or_path": "./output/final_model",
+  "architectures": [
+    "ChessForCausalLM"
+  ],
+  "bos_token_id": 1,
+  "dropout": 0.1,
+  "eos_token_id": 2,
+  "layer_norm_epsilon": 1e-05,
+  "model_type": "chess_transformer",
+  "n_ctx": 256,
+  "n_embd": 96,
+  "n_head": 4,
+  "n_inner": 192,
+  "n_layer": 4,
+  "pad_token_id": 0,
+  "tie_weights": true,
+  "torch_dtype": "float32",
+  "transformers_version": "4.45.2",
+  "vocab_size": 1682
+}

model.safetensors

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:fb86aacd09080467d8f6b574bed068c4a60326aa9dcbd1ede94e738ec3b0c895
+size 1945824

special_tokens_map.json

@@ -0,0 +1,6 @@
+{
+  "bos_token": "[BOS]",
+  "eos_token": "[EOS]",
+  "pad_token": "[PAD]",
+  "unk_token": "[UNK]"
+}

tokenizer.py

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+"""
+Custom Chess Tokenizer for the Chess Challenge.
+
+This tokenizer treats each move as a single token using the extended UCI notation
+from the Lichess dataset (e.g., WPe2e4, BNg8f6).
+
+The dataset format uses:
+- W/B prefix for White/Black
+- Piece letter: P=Pawn, N=Knight, B=Bishop, R=Rook, Q=Queen, K=King
+- Source and destination squares (e.g., e2e4)
+- Special suffixes: (x)=capture, (+)=check, (+*)=checkmate, (o)/(O)=castling
+"""
+
+from __future__ import annotations
+
+import json
+import os
+from pathlib import Path
+from typing import Dict, List, Optional
+
+from transformers import PreTrainedTokenizer
+
+
+class ChessTokenizer(PreTrainedTokenizer):
+    """
+    A custom tokenizer for chess moves using extended UCI notation.
+    
+    This tokenizer maps each possible chess move to a unique token ID.
+    The vocabulary is built from the training dataset to ensure all moves
+    encountered during training have a corresponding token.
+    
+    Example:
+        >>> tokenizer = ChessTokenizer()
+        >>> tokenizer.encode("WPe2e4 BPe7e5")
+        [1, 42, 87, 2]  # [BOS, e2e4, e7e5, EOS]
+    """
+    
+    model_input_names = ["input_ids", "attention_mask"]
+    vocab_files_names = {"vocab_file": "vocab.json"}
+    
+    # Special tokens
+    PAD_TOKEN = "[PAD]"
+    BOS_TOKEN = "[BOS]"
+    EOS_TOKEN = "[EOS]"
+    UNK_TOKEN = "[UNK]"
+    
+    def __init__(
+        self,
+        vocab_file: Optional[str] = None,
+        vocab: Optional[Dict[str, int]] = None,
+        **kwargs,
+    ):
+        """
+        Initialize the chess tokenizer.
+        
+        Args:
+            vocab_file: Path to a JSON file containing the vocabulary mapping.
+            vocab: Dictionary mapping tokens to IDs (alternative to vocab_file).
+            **kwargs: Additional arguments passed to PreTrainedTokenizer.
+        """
+        # Initialize special tokens
+        self._pad_token = self.PAD_TOKEN
+        self._bos_token = self.BOS_TOKEN
+        self._eos_token = self.EOS_TOKEN
+        self._unk_token = self.UNK_TOKEN
+
+        # Remove any duplicate special-token entries passed through kwargs
+        # to avoid "multiple values for keyword" errors when loading from disk.
+        kwargs.pop("pad_token", None)
+        kwargs.pop("bos_token", None)
+        kwargs.pop("eos_token", None)
+        kwargs.pop("unk_token", None)
+        
+        # Load or create vocabulary
+        if vocab is not None:
+            self._vocab = vocab
+        elif vocab_file is not None and os.path.exists(vocab_file):
+            with open(vocab_file, "r", encoding="utf-8") as f:
+                self._vocab = json.load(f)
+        else:
+            # Create a minimal vocabulary with just special tokens
+            # The full vocabulary should be built from the dataset
+            self._vocab = self._create_default_vocab()
+        
+        # Create reverse mapping
+        self._ids_to_tokens = {v: k for k, v in self._vocab.items()}
+        
+        # Call parent init AFTER setting up vocab
+        super().__init__(
+            pad_token=self._pad_token,
+            bos_token=self._bos_token,
+            eos_token=self._eos_token,
+            unk_token=self._unk_token,
+            **kwargs,
+        )
+    
+    def _create_default_vocab(self) -> Dict[str, int]:
+        """
+        Create a minimal default vocabulary with just special tokens.
+        
+        For the full vocabulary, use `build_vocab_from_dataset()`.
+        This minimal vocab is just a placeholder - you should build from data.
+        """
+        special_tokens = [self.PAD_TOKEN, self.BOS_TOKEN, self.EOS_TOKEN, self.UNK_TOKEN]
+        vocab = {token: idx for idx, token in enumerate(special_tokens)}
+        return vocab
+    
+    @classmethod
+    def build_vocab_from_iterator(
+        cls,
+        iterator,
+        min_frequency: int = 1,
+        max_vocab: Optional[int] = None,
+    ) -> "ChessTokenizer":
+        from collections import Counter
+
+        token_counts = Counter()
+        for game in iterator:
+            token_counts.update(game.strip().split())
+
+        # filter by frequency
+        items = [(tok, c) for tok, c in token_counts.items() if c >= min_frequency]
+        # sort by (freq desc, token asc) for reproducibility
+        items.sort(key=lambda x: (-x[1], x[0]))
+
+        if max_vocab is not None:
+            items = items[:max_vocab]
+
+        tokens = [tok for tok, _ in items]
+
+        special_tokens = [cls.PAD_TOKEN, cls.BOS_TOKEN, cls.EOS_TOKEN, cls.UNK_TOKEN]
+        vocab = {token: idx for idx, token in enumerate(special_tokens + tokens)}
+        return cls(vocab=vocab)
+
+    
+    @classmethod
+    def build_vocab_from_dataset(
+        cls,
+        dataset_name: str = "dlouapre/lichess_2025-01_1M",
+        split: str = "train",
+        column: str = "text",
+        min_frequency: int = 500,
+        max_samples: Optional[int] = 100000,
+        max_vocab: Optional[int] = None,
+    ) -> "ChessTokenizer":
+        from datasets import load_dataset
+        dataset = load_dataset(dataset_name, split=split)
+        if max_samples is not None:
+            dataset = dataset.select(range(min(max_samples, len(dataset))))
+    
+        def game_iterator():
+            for example in dataset:
+                yield example[column]
+    
+        return cls.build_vocab_from_iterator(
+            game_iterator(),
+            min_frequency=min_frequency,
+            max_vocab=max_vocab,
+        )
+
+    
+    @property
+    def vocab_size(self) -> int:
+        """Return the size of the vocabulary."""
+        return len(self._vocab)
+    
+    def get_vocab(self) -> Dict[str, int]:
+        """Return the vocabulary as a dictionary."""
+        return dict(self._vocab)
+    
+    def _tokenize(self, text: str) -> List[str]:
+        """
+        Tokenize a string of moves into a list of tokens.
+        
+        Args:
+            text: A string of space-separated moves.
+        
+        Returns:
+            List of move tokens.
+        """
+        return text.strip().split()
+    
+    def _convert_token_to_id(self, token: str) -> int:
+        """Convert a token to its ID."""
+        return self._vocab.get(token, self._vocab.get(self.UNK_TOKEN, 0))
+    
+    def _convert_id_to_token(self, index: int) -> str:
+        """Convert an ID to its token."""
+        return self._ids_to_tokens.get(index, self.UNK_TOKEN)
+    
+    def convert_tokens_to_string(self, tokens: List[str]) -> str:
+        """Convert a list of tokens back to a string."""
+        # Filter out special tokens for cleaner output
+        special = {self.PAD_TOKEN, self.BOS_TOKEN, self.EOS_TOKEN, self.UNK_TOKEN}
+        return " ".join(t for t in tokens if t not in special)
+    
+    def save_vocabulary(
+        self,
+        save_directory: str,
+        filename_prefix: Optional[str] = None,
+    ) -> tuple:
+        """
+        Save the vocabulary to a JSON file.
+        
+        Args:
+            save_directory: Directory to save the vocabulary.
+            filename_prefix: Optional prefix for the filename.
+        
+        Returns:
+            Tuple containing the path to the saved vocabulary file.
+        """
+        if not os.path.isdir(save_directory):
+            os.makedirs(save_directory, exist_ok=True)
+        
+        vocab_file = os.path.join(
+            save_directory,
+            (filename_prefix + "-" if filename_prefix else "") + "vocab.json",
+        )
+        
+        with open(vocab_file, "w", encoding="utf-8") as f:
+            json.dump(self._vocab, f, ensure_ascii=False, indent=2)
+        
+        return (vocab_file,)
+
+
+def count_vocab_from_dataset(
+    dataset_name: str = "dlouapre/lichess_2025-01_1M",
+    split: str = "train",
+    column: str = "text",
+    max_samples: Optional[int] = 10000,
+) -> Dict[str, int]:
+    """
+    Count token frequencies in a dataset (useful for vocabulary analysis).
+    
+    Args:
+        dataset_name: Name of the dataset on Hugging Face Hub.
+        split: Dataset split to use.
+        column: Column containing the game strings.
+        max_samples: Maximum number of samples to process.
+    
+    Returns:
+        Dictionary mapping tokens to their frequencies.
+    """
+    from collections import Counter
+    from datasets import load_dataset
+    
+    dataset = load_dataset(dataset_name, split=split)
+    
+    if max_samples is not None:
+        dataset = dataset.select(range(min(max_samples, len(dataset))))
+    
+    token_counts = Counter()
+    
+    for example in dataset:
+        moves = example[column].strip().split()
+        token_counts.update(moves)
+    
+    return dict(token_counts)

tokenizer_config.json

@@ -0,0 +1,49 @@
+{
+  "added_tokens_decoder": {
+    "0": {
+      "content": "[PAD]",
+      "lstrip": false,
+      "normalized": false,
+      "rstrip": false,
+      "single_word": false,
+      "special": true
+    },
+    "1": {
+      "content": "[BOS]",
+      "lstrip": false,
+      "normalized": false,
+      "rstrip": false,
+      "single_word": false,
+      "special": true
+    },
+    "2": {
+      "content": "[EOS]",
+      "lstrip": false,
+      "normalized": false,
+      "rstrip": false,
+      "single_word": false,
+      "special": true
+    },
+    "3": {
+      "content": "[UNK]",
+      "lstrip": false,
+      "normalized": false,
+      "rstrip": false,
+      "single_word": false,
+      "special": true
+    }
+  },
+  "auto_map": {
+    "AutoTokenizer": [
+      "tokenizer.ChessTokenizer",
+      null
+    ]
+  },
+  "bos_token": "[BOS]",
+  "clean_up_tokenization_spaces": false,
+  "eos_token": "[EOS]",
+  "model_max_length": 1000000000000000019884624838656,
+  "pad_token": "[PAD]",
+  "tokenizer_class": "ChessTokenizer",
+  "unk_token": "[UNK]"
+}

vocab.json

@@ -0,0 +1,1684 @@
+{
+  "[PAD]": 0,
+  "[BOS]": 1,
+  "[EOS]": 2,
+  "[UNK]": 3,
+  "WNg1f3": 4,
+  "BNg8f6": 5,
+  "WPe2e4": 6,
+  "WPd2d4": 7,
+  "WKe1g1(o)": 8,
+  "WNb1c3": 9,
+  "BNb8c6": 10,
+  "BKe8g8(o)": 11,
+  "BPd7d5": 12,
+  "BPe7e6": 13,
+  "BPe7e5": 14,
+  "BPd7d6": 15,
+  "WPc2c3": 16,
+  "WPh2h3": 17,
+  "BPg7g6": 18,
+  "BPc7c6": 19,
+  "BPh7h6": 20,
+  "BPc7c5": 21,
+  "BPa7a6": 22,
+  "WPc2c4": 23,
+  "WPa2a3": 24,
+  "BBf8e7": 25,
+  "WPg2g3": 26,
+  "WPe2e3": 27,
+  "WPf2f4": 28,
+  "WPd2d3": 29,
+  "BNb8d7": 30,
+  "BPb7b6": 31,
+  "WRf1e1": 32,
+  "WPe4e5": 33,
+  "WNb1d2": 34,
+  "BPf7f6": 35,
+  "WPb2b3": 36,
+  "WBf1d3": 37,
+  "WBf1c4": 38,
+  "BPb7b5": 39,
+  "WPf2f3": 40,
+  "WBc1e3": 41,
+  "WBc1g5": 42,
+  "WPe4d5(x)": 43,
+  "BBf8g7": 44,
+  "BBc8g4": 45,
+  "BRf8e8": 46,
+  "BPf7f5": 47,
+  "WBf1e2": 48,
+  "WPb2b4": 49,
+  "BPc5d4(x)": 50,
+  "BBc8b7": 51,
+  "WPg2g4": 52,
+  "WPa2a4": 53,
+  "WPh2h4": 54,
+  "BPa7a5": 55,
+  "BBc8d7": 56,
+  "WNf3e5": 57,
+  "WBc1f4": 58,
+  "WPd4d5": 59,
+  "BBf8d6": 60,
+  "WPd4e5(x)": 61,
+  "BPh7h5": 62,
+  "BRa8c8": 63,
+  "BNg8e7": 64,
+  "BBc8e6": 65,
+  "BPe6e5": 66,
+  "BPe5d4(x)": 67,
+  "WRa1d1": 68,
+  "BPd5e4(x)": 69,
+  "WNf3d4(x)": 70,
+  "WKg1h1": 71,
+  "WRa1c1": 72,
+  "BPc6c5": 73,
+  "WKe1c1(O)": 74,
+  "BBf8c5": 75,
+  "BPg7g5": 76,
+  "BRa8d8": 77,
+  "WQd1e2": 78,
+  "BNf6e4": 79,
+  "WBf1g2": 80,
+  "BBc8f5": 81,
+  "WBc1d2": 82,
+  "BKg8h8": 83,
+  "WNf3e5(x)": 84,
+  "WPc4d5(x)": 85,
+  "WBc1b2": 86,
+  "BKe8c8(O)": 87,
+  "BPe5e4": 88,
+  "WPh4h5": 89,
+  "BPe6d5(x)": 90,
+  "WQd1d2": 91,
+  "BPd6d5": 92,
+  "BQd8e7": 93,
+  "BRa8b8": 94,
+  "BPd5d4": 95,
+  "WNf3g5": 96,
+  "WPc3c4": 97,
+  "BNf6e4(x)": 98,
+  "BPb5b4": 99,
+  "BQd8c7": 100,
+  "WRa1b1": 101,
+  "BPd6e5(x)": 102,
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+  "BPa5a4": 109,
+  "WPf4f5": 110,
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+  "WPh3h4": 112,
+  "WNg1e2": 113,
+  "BNc6d4": 114,
+  "WPd3d4": 115,
+  "BKg8g7": 116,
+  "WBf1b5": 117,
+  "WKg1h2": 118,
+  "BBg4f3(x)": 119,
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+  "WPb4b5": 132,
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+  "BPh5h4": 134,
+  "WQd1f3": 135,
+  "WRf1d1": 136,
+  "BRf8d8": 137,
+  "WBg5f6(x)": 138,
+  "BKg8h7": 139,
+  "WNc3e4": 140,
+  "BNc6e5(x)": 141,
+  "BNf6d7": 142,
+  "WPf3f4": 143,
+  "BPf6f5": 144,
+  "BPh6h5": 145,
+  "BNc6d4(x)": 146,
+  "WPg3g4": 147,
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+  "BNf6g4": 149,
+  "BPg5g4": 150,
+  "BPd5c4(x)": 151,
+  "WNc3e2": 152,
+  "BPf5f4": 153,
+  "WNc3d5(x)": 154,
+  "WNd2f3": 155,
+  "WPd4c5(x)": 156,
+  "BNc6e5": 157,
+  "WPf4e5(x)": 158,
+  "WKg1f2": 159,
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+  "WBc4b3": 167,
+  "WPa3a4": 168,
+  "WKg1f1": 169,
+  "WNf3d4": 170,
+  "WPg2f3(x)": 171,
+  "BKg8f8": 172,
+  "WPb3b4": 173,
+  "BPg7f6(x)": 174,
+  "BNc6e7": 175,
+  "WNf3d2": 176,
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+  "WNc3b5": 179,
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+  "WQd1d4(x)": 188,
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+  "BNd7e5(x)": 191,
+  "BNe7f5": 192,
+  "WPe3d4(x)": 193,
+  "BBe7f6": 194,
+  "BPf6e5(x)": 195,
+  "BKc8b8": 196,
+  "BNd7c5": 197,
+  "WQd1f3(x)": 198,
+  "WPe4f5(x)": 199,
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+  "WPe5e6": 205,
+  "WQd1d3": 206,
+  "WNc3a4": 207,
+  "WPh3g4(x)": 208,
+  "BPa6b5(x)": 209,
+  "BPa4a3": 210,
+  "BRf8c8": 211,
+  "WBf4g3": 212,
+  "WRh1g1": 213,
+  "WNd2b3": 214,
+  "WBb5c6(x)": 215,
+  "WPe5f6(x)": 216,
+  "BKe8d7": 217,
+  "WPd5d6": 218,
+  "BNd7e5": 219,
+  "WBe2f3": 220,
+  "WPh5h6": 221,
+  "WPa3b4(x)": 222,
+  "BKe8e7": 223,
+  "WRd1e1": 224,
+  "BKf8e7": 225,
+  "BPh7g6(x)": 226,
+  "BBe7f6(x)": 227,
+  "WPa5a6": 228,
+  "WKf1e2": 229,
+  "WNd2c4": 230,
+  "WNd2e4": 231,
+  "WNd2e4(x)": 232,
+  "WPf3e4(x)": 233,
+  "BBb4c3(x)": 234,
+  "BRf8f7": 235,
+  "BQd8f6(x)": 236,
+  "BBe7d6": 237,
+  "WRa1f1": 238,
+  "WRf1f2": 239,
+  "BBc5b6": 240,
+  "BRa8f8": 241,
+  "WRh1e1": 242,
+  "WPa4b5(x)": 243,
+  "BPd4d3": 244,
+  "BKe8f8": 245,
+  "BPe6f5(x)": 246,
+  "BBc8a6": 247,
+  "BRd8e8": 248,
+  "BPf7g6(x)": 249,
+  "WNe2f4": 250,
+  "WRe1e2": 251,
+  "BRh8f8": 252,
+  "BPa5b4(x)": 253,
+  "WRf1c1": 254,
+  "BRh8e8": 255,
+  "WBf1b5(+)": 256,
+  "WNd4c6(x)": 257,
+  "BKg7f6": 258,
+  "WBe2d3": 259,
+  "BPb5c4(x)": 260,
+  "WRd1d2": 261,
+  "BPe4e3": 262,
+  "BQd8d6": 263,
+  "WBc4d3": 264,
+  "BBh5g6": 265,
+  "WPe5d6(x)": 266,
+  "WKg2f3": 267,
+  "BRd8d7": 268,
+  "WBh4g3": 269,
+  "WRe1d1": 270,
+  "BQd8a5": 271,
+  "WKf2e3": 272,
+  "BNb8a6": 273,
+  "BNg8h6": 274,
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