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{
 "cells": [
  {
   "cell_type": "code",
   "execution_count": 1,
   "id": "a5d77a87",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Old keys example: ['head.weight', 'head.bias']\n",
      "New keys example: ['lm_head.weight', 'lm_head.bias']\n"
     ]
    }
   ],
   "source": [
    "import torch\n",
    "\n",
    "ckpt_path = r\"C:\\Users\\Dinesh\\Downloads\\temple_model_bundle_20260201 2\\temple_model_bundle_20260201\\tamil_clm_15m_instruction.pt\"\n",
    "\n",
    "state = torch.load(ckpt_path, map_location=\"cpu\")\n",
    "\n",
    "# --- Rename head.* β†’ lm_head.* ---\n",
    "new_state = {}\n",
    "\n",
    "for k, v in state.items():\n",
    "    if k.startswith(\"head.\"):\n",
    "        new_state[k.replace(\"head.\", \"lm_head.\")] = v\n",
    "    else:\n",
    "        new_state[k] = v\n",
    "\n",
    "# Optional sanity check\n",
    "print(\"Old keys example:\", [k for k in state.keys() if k.startswith(\"head.\")][:2])\n",
    "print(\"New keys example:\", [k for k in new_state.keys() if k.startswith(\"lm_head.\")][:2])\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "id": "3dd294ef",
   "metadata": {},
   "outputs": [
    {
     "name": "stderr",
     "output_type": "stream",
     "text": [
      "c:\\Users\\Dinesh\\anaconda3\\envs\\tamil-llm\\Lib\\site-packages\\tqdm\\auto.py:21: TqdmWarning: IProgress not found. Please update jupyter and ipywidgets. See https://ipywidgets.readthedocs.io/en/stable/user_install.html\n",
      "  from .autonotebook import tqdm as notebook_tqdm\n"
     ]
    },
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "βœ… Model loaded with exact weights (strict)\n"
     ]
    }
   ],
   "source": [
    "import torch\n",
    "from tamil_clm_hf import TamilCLMConfig, TamilCLMForCausalLM\n",
    "\n",
    "DEVICE = \"cuda\" if torch.cuda.is_available() else \"cpu\"\n",
    "\n",
    "config = TamilCLMConfig()\n",
    "model = TamilCLMForCausalLM(config).to(DEVICE)\n",
    "\n",
    "model.load_state_dict(new_state, strict=True)\n",
    "model.eval()\n",
    "\n",
    "print(\"βœ… Model loaded with exact weights (strict)\")\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "id": "0fa1e1d9",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "SentencePiece vocab size: 8000\n",
      "βœ… SentencePiece tokenizer is correct\n"
     ]
    }
   ],
   "source": [
    "import sentencepiece as spm\n",
    "\n",
    "SP_MODEL = r\"C:\\Users\\Dinesh\\Downloads\\temple_model_bundle_20260201 2\\temple_model_bundle_20260201\\tamil_clm.model\"\n",
    "\n",
    "sp = spm.SentencePieceProcessor()\n",
    "sp.load(SP_MODEL)\n",
    "\n",
    "print(\"SentencePiece vocab size:\", sp.get_piece_size())\n",
    "assert sp.get_piece_size() == 8000\n",
    "print(\"βœ… SentencePiece tokenizer is correct\")\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 8,
   "id": "ef2cc03e",
   "metadata": {},
   "outputs": [],
   "source": [
    "from transformers import PreTrainedTokenizer\n",
    "\n",
    "class TamilSentencePieceTokenizer(PreTrainedTokenizer):\n",
    "    model_input_names = [\"input_ids\", \"attention_mask\"]\n",
    "\n",
    "    def __init__(self, sp_model_path, **kwargs):\n",
    "        self.sp = spm.SentencePieceProcessor()\n",
    "        self.sp.load(sp_model_path)\n",
    "        super().__init__(**kwargs)\n",
    "\n",
    "    @property\n",
    "    def vocab_size(self):\n",
    "        return self.sp.get_piece_size()\n",
    "\n",
    "    def _tokenize(self, text):\n",
    "        return self.sp.encode(text, out_type=str)\n",
    "\n",
    "    def _convert_token_to_id(self, token):\n",
    "        return self.sp.piece_to_id(token)\n",
    "\n",
    "    def _convert_id_to_token(self, index):\n",
    "        return self.sp.id_to_piece(index)\n",
    "\n",
    "    def get_vocab(self):\n",
    "        return {self.sp.id_to_piece(i): i for i in range(self.vocab_size)}\n",
    "\n",
    "    def save_vocabulary(self, save_directory, filename_prefix=None):\n",
    "        return ()\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 12,
   "id": "048dda1d",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Tokenizer vocab size: 8000\n",
      "βœ… Slow tokenizer ready\n"
     ]
    }
   ],
   "source": [
    "slow_tokenizer = TamilSentencePieceTokenizer(\n",
    "    SP_MODEL,\n",
    "    bos_token=\"<s>\",\n",
    "    eos_token=\"</s>\",\n",
    "    unk_token=\"<unk>\",\n",
    "    pad_token=\"<pad>\"\n",
    ")\n",
    "\n",
    "print(\"Tokenizer vocab size:\", slow_tokenizer.vocab_size)\n",
    "assert slow_tokenizer.vocab_size == 8000\n",
    "print(\"βœ… Slow tokenizer ready\")\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 13,
   "id": "3048571c",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "βœ… Slow tokenizer saved to HF directory\n"
     ]
    }
   ],
   "source": [
    "HF_DIR = r\"C:\\Users\\Dinesh\\hf_tamil_clm_15m\"\n",
    "\n",
    "slow_tokenizer.save_pretrained(HF_DIR)\n",
    "print(\"βœ… Slow tokenizer saved to HF directory\")\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 15,
   "id": "c9eba604",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "protobuf + sentencepiece OK\n"
     ]
    }
   ],
   "source": [
    "import sentencepiece, google.protobuf\n",
    "print(\"protobuf + sentencepiece OK\")\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 17,
   "id": "f83b6371",
   "metadata": {},
   "outputs": [
    {
     "ename": "ImportError",
     "evalue": "\n requires the protobuf library but it was not found in your environment. Check out the instructions on the\ninstallation page of its repo: https://github.com/protocolbuffers/protobuf/tree/master/python#installation and follow the ones\nthat match your environment. Please note that you may need to restart your runtime after installation.\n",
     "output_type": "error",
     "traceback": [
      "\u001b[31m---------------------------------------------------------------------------\u001b[39m",
      "\u001b[31mValueError\u001b[39m                                Traceback (most recent call last)",
      "\u001b[36mFile \u001b[39m\u001b[32mc:\\Users\\Dinesh\\anaconda3\\envs\\tamil-llm\\Lib\\site-packages\\transformers\\tokenization_utils_base.py:2003\u001b[39m, in \u001b[36mPreTrainedTokenizerBase._from_pretrained\u001b[39m\u001b[34m(cls, resolved_vocab_files, pretrained_model_name_or_path, init_configuration, token, cache_dir, local_files_only, _commit_hash, _is_local, trust_remote_code, *init_inputs, **kwargs)\u001b[39m\n\u001b[32m   2002\u001b[39m \u001b[38;5;28;01mtry\u001b[39;00m:\n\u001b[32m-> \u001b[39m\u001b[32m2003\u001b[39m     tokenizer = \u001b[38;5;28;43mcls\u001b[39;49m\u001b[43m(\u001b[49m\u001b[43m*\u001b[49m\u001b[43minit_inputs\u001b[49m\u001b[43m,\u001b[49m\u001b[43m \u001b[49m\u001b[43m*\u001b[49m\u001b[43m*\u001b[49m\u001b[43minit_kwargs\u001b[49m\u001b[43m)\u001b[49m\n\u001b[32m   2004\u001b[39m \u001b[38;5;28;01mexcept\u001b[39;00m import_protobuf_decode_error():\n",
      "\u001b[36mFile \u001b[39m\u001b[32mc:\\Users\\Dinesh\\anaconda3\\envs\\tamil-llm\\Lib\\site-packages\\transformers\\tokenization_utils_tokenizers.py:274\u001b[39m, in \u001b[36mTokenizersBackend.__init__\u001b[39m\u001b[34m(self, *args, **kwargs)\u001b[39m\n\u001b[32m    273\u001b[39m \u001b[38;5;28;01melif\u001b[39;00m \u001b[38;5;28mself\u001b[39m._tokenizer \u001b[38;5;129;01mis\u001b[39;00m \u001b[38;5;28;01mNone\u001b[39;00m:\n\u001b[32m--> \u001b[39m\u001b[32m274\u001b[39m     \u001b[38;5;28;01mraise\u001b[39;00m \u001b[38;5;167;01mValueError\u001b[39;00m(\n\u001b[32m    275\u001b[39m         \u001b[33m\"\u001b[39m\u001b[33mCouldn\u001b[39m\u001b[33m'\u001b[39m\u001b[33mt instantiate the backend tokenizer from one of: \u001b[39m\u001b[38;5;130;01m\\n\u001b[39;00m\u001b[33m\"\u001b[39m\n\u001b[32m    276\u001b[39m         \u001b[33m\"\u001b[39m\u001b[33m(1) a `tokenizers` library serialization file, \u001b[39m\u001b[38;5;130;01m\\n\u001b[39;00m\u001b[33m\"\u001b[39m\n\u001b[32m    277\u001b[39m         \u001b[33m\"\u001b[39m\u001b[33m(2) a slow tokenizer instance to convert or \u001b[39m\u001b[38;5;130;01m\\n\u001b[39;00m\u001b[33m\"\u001b[39m\n\u001b[32m    278\u001b[39m         \u001b[33m\"\u001b[39m\u001b[33m(3) an equivalent slow tokenizer class to instantiate and convert. \u001b[39m\u001b[38;5;130;01m\\n\u001b[39;00m\u001b[33m\"\u001b[39m\n\u001b[32m    279\u001b[39m         \u001b[33m\"\u001b[39m\u001b[33mYou need to have sentencepiece or tiktoken installed to convert a slow tokenizer to a fast one.\u001b[39m\u001b[33m\"\u001b[39m\n\u001b[32m    280\u001b[39m     )\n\u001b[32m    281\u001b[39m \u001b[38;5;66;03m# Only set defaults when creating TokenizersBackend from scratch\u001b[39;00m\n",
      "\u001b[31mValueError\u001b[39m: Couldn't instantiate the backend tokenizer from one of: \n(1) a `tokenizers` library serialization file, \n(2) a slow tokenizer instance to convert or \n(3) an equivalent slow tokenizer class to instantiate and convert. \nYou need to have sentencepiece or tiktoken installed to convert a slow tokenizer to a fast one.",
      "\nDuring handling of the above exception, another exception occurred:\n",
      "\u001b[31mImportError\u001b[39m                               Traceback (most recent call last)",
      "\u001b[36mCell\u001b[39m\u001b[36m \u001b[39m\u001b[32mIn[17]\u001b[39m\u001b[32m, line 5\u001b[39m\n\u001b[32m      1\u001b[39m \u001b[38;5;28;01mfrom\u001b[39;00m\u001b[38;5;250m \u001b[39m\u001b[34;01mtransformers\u001b[39;00m\u001b[38;5;250m \u001b[39m\u001b[38;5;28;01mimport\u001b[39;00m AutoTokenizer, AutoModelForCausalLM\n\u001b[32m      3\u001b[39m HF_DIR = \u001b[33mr\u001b[39m\u001b[33m\"\u001b[39m\u001b[33mC:\u001b[39m\u001b[33m\\\u001b[39m\u001b[33mUsers\u001b[39m\u001b[33m\\\u001b[39m\u001b[33mDinesh\u001b[39m\u001b[33m\\\u001b[39m\u001b[33mhf_tamil_clm_15m\u001b[39m\u001b[33m\"\u001b[39m\n\u001b[32m----> \u001b[39m\u001b[32m5\u001b[39m tokenizer = \u001b[43mAutoTokenizer\u001b[49m\u001b[43m.\u001b[49m\u001b[43mfrom_pretrained\u001b[49m\u001b[43m(\u001b[49m\n\u001b[32m      6\u001b[39m \u001b[43m    \u001b[49m\u001b[43mHF_DIR\u001b[49m\u001b[43m,\u001b[49m\n\u001b[32m      7\u001b[39m \u001b[43m    \u001b[49m\u001b[43muse_fast\u001b[49m\u001b[43m=\u001b[49m\u001b[38;5;28;43;01mFalse\u001b[39;49;00m\u001b[43m,\u001b[49m\n\u001b[32m      8\u001b[39m \u001b[43m    \u001b[49m\u001b[43mtrust_remote_code\u001b[49m\u001b[43m=\u001b[49m\u001b[38;5;28;43;01mTrue\u001b[39;49;00m\n\u001b[32m      9\u001b[39m \u001b[43m)\u001b[49m\n\u001b[32m     11\u001b[39m model = AutoModelForCausalLM.from_pretrained(\n\u001b[32m     12\u001b[39m     HF_DIR,\n\u001b[32m     13\u001b[39m     trust_remote_code=\u001b[38;5;28;01mTrue\u001b[39;00m\n\u001b[32m     14\u001b[39m )\n\u001b[32m     16\u001b[39m \u001b[38;5;28mprint\u001b[39m(\u001b[33m\"\u001b[39m\u001b[33mπŸŽ‰ LOCAL HF LOAD SUCCESS\u001b[39m\u001b[33m\"\u001b[39m)\n",
      "\u001b[36mFile \u001b[39m\u001b[32mc:\\Users\\Dinesh\\anaconda3\\envs\\tamil-llm\\Lib\\site-packages\\transformers\\models\\auto\\tokenization_auto.py:702\u001b[39m, in \u001b[36mAutoTokenizer.from_pretrained\u001b[39m\u001b[34m(cls, pretrained_model_name_or_path, *inputs, **kwargs)\u001b[39m\n\u001b[32m    699\u001b[39m     \u001b[38;5;28;01mif\u001b[39;00m tokenizer_class \u001b[38;5;129;01mis\u001b[39;00m \u001b[38;5;28;01mNone\u001b[39;00m:\n\u001b[32m    700\u001b[39m         tokenizer_class = TokenizersBackend\n\u001b[32m--> \u001b[39m\u001b[32m702\u001b[39m     \u001b[38;5;28;01mreturn\u001b[39;00m \u001b[43mtokenizer_class\u001b[49m\u001b[43m.\u001b[49m\u001b[43mfrom_pretrained\u001b[49m\u001b[43m(\u001b[49m\u001b[43mpretrained_model_name_or_path\u001b[49m\u001b[43m,\u001b[49m\u001b[43m \u001b[49m\u001b[43m*\u001b[49m\u001b[43minputs\u001b[49m\u001b[43m,\u001b[49m\u001b[43m \u001b[49m\u001b[43m*\u001b[49m\u001b[43m*\u001b[49m\u001b[43mkwargs\u001b[49m\u001b[43m)\u001b[49m\n\u001b[32m    703\u001b[39m \u001b[38;5;28;01melif\u001b[39;00m \u001b[38;5;28mgetattr\u001b[39m(config, \u001b[33m\"\u001b[39m\u001b[33mtokenizer_class\u001b[39m\u001b[33m\"\u001b[39m, \u001b[38;5;28;01mNone\u001b[39;00m):\n\u001b[32m    704\u001b[39m     _class = config.tokenizer_class\n",
      "\u001b[36mFile \u001b[39m\u001b[32mc:\\Users\\Dinesh\\anaconda3\\envs\\tamil-llm\\Lib\\site-packages\\transformers\\tokenization_utils_base.py:1751\u001b[39m, in \u001b[36mPreTrainedTokenizerBase.from_pretrained\u001b[39m\u001b[34m(cls, pretrained_model_name_or_path, cache_dir, force_download, local_files_only, token, revision, trust_remote_code, *init_inputs, **kwargs)\u001b[39m\n\u001b[32m   1748\u001b[39m     \u001b[38;5;28;01mif\u001b[39;00m file_id \u001b[38;5;129;01mnot\u001b[39;00m \u001b[38;5;129;01min\u001b[39;00m resolved_vocab_files:\n\u001b[32m   1749\u001b[39m         \u001b[38;5;28;01mcontinue\u001b[39;00m\n\u001b[32m-> \u001b[39m\u001b[32m1751\u001b[39m \u001b[38;5;28;01mreturn\u001b[39;00m \u001b[38;5;28;43mcls\u001b[39;49m\u001b[43m.\u001b[49m\u001b[43m_from_pretrained\u001b[49m\u001b[43m(\u001b[49m\n\u001b[32m   1752\u001b[39m \u001b[43m    \u001b[49m\u001b[43mresolved_vocab_files\u001b[49m\u001b[43m,\u001b[49m\n\u001b[32m   1753\u001b[39m \u001b[43m    \u001b[49m\u001b[43mpretrained_model_name_or_path\u001b[49m\u001b[43m,\u001b[49m\n\u001b[32m   1754\u001b[39m \u001b[43m    \u001b[49m\u001b[43minit_configuration\u001b[49m\u001b[43m,\u001b[49m\n\u001b[32m   1755\u001b[39m \u001b[43m    \u001b[49m\u001b[43m*\u001b[49m\u001b[43minit_inputs\u001b[49m\u001b[43m,\u001b[49m\n\u001b[32m   1756\u001b[39m \u001b[43m    \u001b[49m\u001b[43mtoken\u001b[49m\u001b[43m=\u001b[49m\u001b[43mtoken\u001b[49m\u001b[43m,\u001b[49m\n\u001b[32m   1757\u001b[39m \u001b[43m    \u001b[49m\u001b[43mcache_dir\u001b[49m\u001b[43m=\u001b[49m\u001b[43mcache_dir\u001b[49m\u001b[43m,\u001b[49m\n\u001b[32m   1758\u001b[39m \u001b[43m    \u001b[49m\u001b[43mlocal_files_only\u001b[49m\u001b[43m=\u001b[49m\u001b[43mlocal_files_only\u001b[49m\u001b[43m,\u001b[49m\n\u001b[32m   1759\u001b[39m \u001b[43m    \u001b[49m\u001b[43m_commit_hash\u001b[49m\u001b[43m=\u001b[49m\u001b[43mcommit_hash\u001b[49m\u001b[43m,\u001b[49m\n\u001b[32m   1760\u001b[39m \u001b[43m    \u001b[49m\u001b[43m_is_local\u001b[49m\u001b[43m=\u001b[49m\u001b[43mis_local\u001b[49m\u001b[43m,\u001b[49m\n\u001b[32m   1761\u001b[39m \u001b[43m    \u001b[49m\u001b[43mtrust_remote_code\u001b[49m\u001b[43m=\u001b[49m\u001b[43mtrust_remote_code\u001b[49m\u001b[43m,\u001b[49m\n\u001b[32m   1762\u001b[39m \u001b[43m    \u001b[49m\u001b[43m*\u001b[49m\u001b[43m*\u001b[49m\u001b[43mkwargs\u001b[49m\u001b[43m,\u001b[49m\n\u001b[32m   1763\u001b[39m \u001b[43m\u001b[49m\u001b[43m)\u001b[49m\n",
      "\u001b[36mFile \u001b[39m\u001b[32mc:\\Users\\Dinesh\\anaconda3\\envs\\tamil-llm\\Lib\\site-packages\\transformers\\tokenization_utils_base.py:2004\u001b[39m, in \u001b[36mPreTrainedTokenizerBase._from_pretrained\u001b[39m\u001b[34m(cls, resolved_vocab_files, pretrained_model_name_or_path, init_configuration, token, cache_dir, local_files_only, _commit_hash, _is_local, trust_remote_code, *init_inputs, **kwargs)\u001b[39m\n\u001b[32m   2002\u001b[39m \u001b[38;5;28;01mtry\u001b[39;00m:\n\u001b[32m   2003\u001b[39m     tokenizer = \u001b[38;5;28mcls\u001b[39m(*init_inputs, **init_kwargs)\n\u001b[32m-> \u001b[39m\u001b[32m2004\u001b[39m \u001b[38;5;28;01mexcept\u001b[39;00m \u001b[43mimport_protobuf_decode_error\u001b[49m\u001b[43m(\u001b[49m\u001b[43m)\u001b[49m:\n\u001b[32m   2005\u001b[39m     \u001b[38;5;28;01mraise\u001b[39;00m \u001b[38;5;167;01mRuntimeError\u001b[39;00m(\n\u001b[32m   2006\u001b[39m         \u001b[33m\"\u001b[39m\u001b[33mUnable to load tokenizer model from SPM, loading from TikToken will be attempted instead.\u001b[39m\u001b[33m\"\u001b[39m\n\u001b[32m   2007\u001b[39m         \u001b[33m\"\u001b[39m\u001b[33m(Google protobuf error: Tried to load SPM model with non-SPM vocab file).\u001b[39m\u001b[33m\"\u001b[39m,\n\u001b[32m   2008\u001b[39m     )\n\u001b[32m   2009\u001b[39m \u001b[38;5;28;01mexcept\u001b[39;00m \u001b[38;5;167;01mRuntimeError\u001b[39;00m \u001b[38;5;28;01mas\u001b[39;00m e:\n",
      "\u001b[36mFile \u001b[39m\u001b[32mc:\\Users\\Dinesh\\anaconda3\\envs\\tamil-llm\\Lib\\site-packages\\transformers\\tokenization_utils_base.py:79\u001b[39m, in \u001b[36mimport_protobuf_decode_error\u001b[39m\u001b[34m(error_message)\u001b[39m\n\u001b[32m     77\u001b[39m     \u001b[38;5;28;01mreturn\u001b[39;00m DecodeError\n\u001b[32m     78\u001b[39m \u001b[38;5;28;01melse\u001b[39;00m:\n\u001b[32m---> \u001b[39m\u001b[32m79\u001b[39m     \u001b[38;5;28;01mraise\u001b[39;00m \u001b[38;5;167;01mImportError\u001b[39;00m(PROTOBUF_IMPORT_ERROR.format(error_message))\n",
      "\u001b[31mImportError\u001b[39m: \n requires the protobuf library but it was not found in your environment. Check out the instructions on the\ninstallation page of its repo: https://github.com/protocolbuffers/protobuf/tree/master/python#installation and follow the ones\nthat match your environment. Please note that you may need to restart your runtime after installation.\n"
     ]
    }
   ],
   "source": [
    "from transformers import AutoTokenizer, AutoModelForCausalLM\n",
    "\n",
    "HF_DIR = r\"C:\\Users\\Dinesh\\hf_tamil_clm_15m\"\n",
    "\n",
    "tokenizer = AutoTokenizer.from_pretrained(\n",
    "    HF_DIR,\n",
    "    use_fast=False,\n",
    "    trust_remote_code=True\n",
    ")\n",
    "\n",
    "model = AutoModelForCausalLM.from_pretrained(\n",
    "    HF_DIR,\n",
    "    trust_remote_code=True\n",
    ")\n",
    "\n",
    "print(\"πŸŽ‰ LOCAL HF LOAD SUCCESS\")\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "fb116309",
   "metadata": {},
   "outputs": [],
   "source": []
  }
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