Chess Challenge submission by Eithannak

README.md

@@ -0,0 +1,26 @@
+---
+library_name: transformers
+tags:
+- chess
+- llm-course
+- chess-challenge
+license: mit
+---
+
+# chess-model-eithan-nakache-v3
+
+Chess model submitted to the LLM Course Chess Challenge.
+
+## Submission Info
+
+- **Submitted by**: [Eithannak](https://huggingface.co/Eithannak)
+- **Parameters**: 965,040
+- **Organization**: LLM-course
+
+## Model Details
+
+- **Architecture**: Chess Transformer (GPT-style)
+- **Vocab size**: 512
+- **Embedding dim**: 120
+- **Layers**: 6
+- **Heads**: 4

config.json

@@ -0,0 +1,21 @@
+{
+  "architectures": [
+    "ChessForCausalLM"
+  ],
+  "bos_token_id": 1,
+  "dropout": 0.1,
+  "dtype": "float32",
+  "eos_token_id": 2,
+  "layer_norm_epsilon": 1e-05,
+  "model_type": "chess_transformer",
+  "n_ctx": 256,
+  "n_embd": 120,
+  "n_head": 4,
+  "n_inner": 360,
+  "n_layer": 6,
+  "pad_token_id": 0,
+  "tie_weights": true,
+  "transformers_version": "4.57.5",
+  "unk_token_id": 3,
+  "vocab_size": 512
+}

pytorch_model.bin

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+version https://git-lfs.github.com/spec/v1
+oid sha256:b8ee69ac57bb9c15cff3921b710f4b63230e178ce1d73a156fcea9b3e45e00de
+size 3881771

special_tokens_map.json

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

tokenizer.py

@@ -0,0 +1,154 @@
+from __future__ import annotations
+import json
+import os
+import shutil
+import re
+
+from collections import Counter
+from datasets import load_dataset
+from typing import Dict, List, Optional
+from transformers import PreTrainedTokenizer
+
+SQUARE_MOVE_PATTERN = re.compile(r"([a-h][1-8])([a-h][1-8])")
+PROMOTION_PATTERN = re.compile(r"=([NBRQ])")
+
+
+def normalize_move(token: str) -> str:
+    if token.startswith("["):
+        return token
+
+    move_match = SQUARE_MOVE_PATTERN.search(token)
+    if not move_match:
+        return token
+
+    from_sq, to_sq = move_match.group(1), move_match.group(2)
+
+    promotion_suffix = ""
+    promo_match = PROMOTION_PATTERN.search(token)
+    if promo_match:
+        promotion_suffix = "=" + promo_match.group(1)
+
+    piece_prefix = token[:2] if len(token) >= 2 else "WP"
+
+    return f"{piece_prefix}{from_sq}{to_sq}{promotion_suffix}"
+
+
+
+class ChessTokenizer(PreTrainedTokenizer):
+    model_input_names = ["input_ids", "attention_mask"]
+    vocab_files_names = {"vocab_file": "vocab.json"}
+
+    PAD_TOKEN = "[PAD]"
+    BOS_TOKEN = "[BOS]"
+    EOS_TOKEN = "[EOS]"
+    UNK_TOKEN = "[UNK]"
+
+    def __init__(self, vocab_file=None, vocab=None, **kwargs):
+        self._pad_token = self.PAD_TOKEN
+        self._bos_token = self.BOS_TOKEN
+        self._eos_token = self.EOS_TOKEN
+        self._unk_token = self.UNK_TOKEN
+
+        for t in ["pad_token", "bos_token", "eos_token", "unk_token"]:
+            kwargs.pop(t, None)
+
+        if vocab is None:
+            if vocab_file is None:
+                vocab_file = os.path.join(os.path.dirname(__file__), "vocab.json")
+            self.vocab_file = vocab_file
+            if os.path.exists(vocab_file):
+                with open(vocab_file, "r", encoding="utf-8") as f:
+                    self._vocab = json.load(f)
+            else:
+                self._vocab = self._create_default_vocab()
+        else:
+            self._vocab = vocab
+            self.vocab_file = vocab_file
+
+        self._ids_to_tokens = {v: k for k, v in self._vocab.items()}
+        super().__init__(
+            pad_token=self.PAD_TOKEN,
+            bos_token=self.BOS_TOKEN,
+            eos_token=self.EOS_TOKEN,
+            unk_token=self.UNK_TOKEN,
+            **kwargs,
+        )
+
+    def save_pretrained(self, save_directory: str, **kwargs):
+        super().save_pretrained(save_directory, **kwargs)
+        src_path = os.path.abspath(__file__)
+        dst_path = os.path.join(save_directory, "tokenizer.py")
+        if src_path != dst_path:
+            shutil.copy(src_path, dst_path)
+
+        config_path = os.path.join(save_directory, "tokenizer_config.json")
+        if os.path.exists(config_path):
+            with open(config_path, "r") as f:
+                cfg = json.load(f)
+            cfg["auto_map"] = {"AutoTokenizer": "tokenizer.ChessTokenizer"}
+            with open(config_path, "w") as f:
+                json.dump(cfg, f, indent=2)
+
+    def _create_default_vocab(self):
+        return {
+            t: i
+            for i, t in enumerate([self.PAD_TOKEN, self.BOS_TOKEN, self.EOS_TOKEN, self.UNK_TOKEN])
+        }
+
+    @classmethod
+    def build_vocab_from_dataset(
+        cls,
+        dataset_name,
+        split="train",
+        column="text",
+        max_vocab_size=512,
+        min_frequency=500,
+        max_samples=100000,
+    ):
+
+        ds = load_dataset(dataset_name, split=split, streaming=True)
+        ds = ds.take(max_samples)
+
+        counter = Counter()
+        for ex in ds:
+            moves = [normalize_move(t) for t in ex[column].split()]
+            counter.update(moves)
+
+        special = [cls.PAD_TOKEN, cls.BOS_TOKEN, cls.EOS_TOKEN, cls.UNK_TOKEN]
+        most_common = counter.most_common(max_vocab_size - len(special))
+
+        vocab = {t: i for i, t in enumerate(special + [t for t, c in most_common])}
+        return cls(vocab=vocab)
+
+    @property
+    def vocab_size(self):
+        return len(self._vocab)
+
+    def get_vocab(self):
+        return dict(self._vocab)
+
+    def _tokenize(self, text):
+        return [normalize_move(t) for t in text.strip().split()]
+
+    def _convert_token_to_id(self, token):
+        return self._vocab.get(token, self._vocab.get(self.UNK_TOKEN))
+
+    def _convert_id_to_token(self, index):
+        return self._ids_to_tokens.get(index, self.UNK_TOKEN)
+
+    def convert_tokens_to_string(self, tokens):
+        return " ".join(
+            t
+            for t in tokens
+            if t not in [self.PAD_TOKEN, self.BOS_TOKEN, self.EOS_TOKEN, self.UNK_TOKEN]
+        )
+
+    def save_vocabulary(self, save_directory, filename_prefix=None):
+        if not os.path.isdir(save_directory):
+            os.makedirs(save_directory, exist_ok=True)
+        path = os.path.join(
+            save_directory, (filename_prefix + "-" if filename_prefix else "") + "vocab.json"
+        )
+        with open(path, "w", encoding="utf-8") as f:
+            json.dump(self._vocab, f, ensure_ascii=False, indent=2)
+        return (path,)

tokenizer_config.json

@@ -0,0 +1,47 @@
+{
+  "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"
+  },
+  "bos_token": "[BOS]",
+  "clean_up_tokenization_spaces": false,
+  "eos_token": "[EOS]",
+  "extra_special_tokens": {},
+  "model_max_length": 1000000000000000019884624838656,
+  "pad_token": "[PAD]",
+  "tokenizer_class": "ChessTokenizer",
+  "unk_token": "[UNK]"
+}

vocab.json

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+{
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+  "[EOS]": 2,
+  "[UNK]": 3,
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+}