{
 "cells": [
  {
   "cell_type": "code",
   "execution_count": 1,
   "id": "e28fb85c",
   "metadata": {},
   "outputs": [],
   "source": [
    "# %pip install gputil\n",
    "# %pip install setuptools\n",
    "# %pip install transformers\n",
    "# %pip install torch\n",
    "\n",
    "# %pip install auto-gptq #==0.4.0"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "8922a3da",
   "metadata": {},
   "source": [
    "What happens when you rescale the input and output embeddings?"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "id": "0667e71a",
   "metadata": {},
   "outputs": [
    {
     "name": "stderr",
     "output_type": "stream",
     "text": [
      "/home/mick/pycharmprojects/Frankenstein/.venv/lib/python3.12/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"
     ]
    }
   ],
   "source": [
    "import GPUtil\n",
    "\n",
    "from transformers import AutoModelForCausalLM, AutoTokenizer, pipeline\n",
    "import torch\n",
    "# from auto_gptq import AutoGPTQForCausalLM"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "id": "0273f299",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "No GPU detected on this system.\n"
     ]
    }
   ],
   "source": [
    "gpus = GPUtil.getGPUs()\n",
    "if not gpus:\n",
    "    print(\"No GPU detected on this system.\")\n",
    "else:\n",
    "    for gpu in gpus:\n",
    "        print(f\"GPU Name: {gpu.name}\")\n",
    "        print(f\"Total VRAM: {gpu.memoryTotal} MB\")\n",
    "        print(f\"Free VRAM: {gpu.memoryFree} MB\")\n",
    "        print(f\"Used VRAM: {gpu.memoryUsed} MB\")\n",
    "        print(\"-\" * 40)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "id": "67d7e006",
   "metadata": {},
   "outputs": [],
   "source": [
    "def grab_model(model_name, quantized = False):\n",
    "    if quantized:\n",
    "        model = AutoGPTQForCausalLM.from_quantized(model_name, device=\"cpu\", use_safetensors=True)\n",
    "    else:\n",
    "        model = AutoModelForCausalLM.from_pretrained(model_name)\n",
    "\n",
    "    tokenizer = AutoTokenizer.from_pretrained(model_name)\n",
    "    return model, tokenizer"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "id": "153e9ff5",
   "metadata": {},
   "outputs": [],
   "source": [
    "modelA, tokenizerA = grab_model(\"gpt2\")\n",
    "modelB, tokenizerB = grab_model(\"EleutherAI/gpt-neo-125M\")\n",
    "\n",
    "# modelA, tokenizerA = grab_model(\"EleutherAI/gpt-neo-125M-4bit\", quantized=True)\n",
    "# modelB, tokenizerB = grab_model(\"iproskurina/opt-125m-GPTQ-4bit-g128\", quantized=True)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "id": "1da291ed",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "True"
      ]
     },
     "execution_count": 5,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "modelA.config.hidden_size == modelB.config.hidden_size "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 113,
   "id": "c62b2f41",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "tensor(False)\n",
      "tensor(22.2842, grad_fn=<MaxBackward1>)\n",
      "tensor(11.5013, grad_fn=<MeanBackward0>)\n"
     ]
    }
   ],
   "source": [
    "print(torch.isnan(modelB.get_input_embeddings().weight).any())\n",
    "print(torch.norm(modelB.get_input_embeddings().weight, dim=1).max())\n",
    "print(torch.norm(modelB.get_input_embeddings().weight, dim=1).mean())"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "id": "2b9893a3",
   "metadata": {},
   "outputs": [],
   "source": [
    "def check_orthogonal(R):\n",
    "    I = torch.eye(R.size(0), device=R.device)\n",
    "    delta = torch.norm(R.T @ R - I)\n",
    "    print(f\"Delta: {delta:.6e}\")\n",
    "    "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "ff93495e",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "ModelA mean norms: 1.3624546527862549\n",
      "ModelB mean norms: 11.50130844116211\n",
      "0.1184608394563315\n",
      "new_embedding mean norms: 11.50130844116211\n"
     ]
    }
   ],
   "source": [
    "emb1 = modelA.get_input_embeddings().weight\n",
    "emb2 = modelB.get_input_embeddings().weight\n",
    "\n",
    "print(\"ModelA mean norms:\", torch.norm(emb1, dim=1).mean().item())\n",
    "print(\"ModelB mean norms:\", torch.norm(emb2, dim=1).mean().item())\n",
    "\n",
    "scaling_factor = torch.norm(emb1, dim=1).mean().item() / torch.norm(emb2, dim=1).mean().item()\n",
    "\n",
    "print(\"Scaling factor: \", scaling_factor)\n",
    "\n",
    "new_embedding = torch.nn.Embedding.from_pretrained(emb1/scaling_factor)\n",
    "\n",
    "print(\"new_embedding mean norms:\", torch.norm(new_embedding.weight, dim=1).mean().item())\n",
    "\n",
    "modelA.set_input_embeddings(new_embedding)\n",
    "modelA.lm_head.weight = new_embedding.weight\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 109,
   "id": "85957357",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "True"
      ]
     },
     "execution_count": 109,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "modelA.lm_head.out_features == tokenizerA.vocab_size"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 12,
   "id": "d8d9d612",
   "metadata": {},
   "outputs": [
    {
     "name": "stderr",
     "output_type": "stream",
     "text": [
      "Device set to use cpu\n",
      "Setting `pad_token_id` to `eos_token_id`:50256 for open-end generation.\n"
     ]
    },
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "[{'generated_text': 'Hello, how are you?\\n\\nYou are not a new.\\n\\nYou are a new.\\n\\n\\nYou are not a new.\\n\\n\\nYou are not a new.\\n\\n\\na new.\\n\\na new.\\n\\na.\\n\\na.\\n\\na.\\n\\na.\\n\\na.\\n\\na.\\n\\na.\\n\\na.\\n\\na\\n\\na.\\n\\na\\n\\n.\\na\\n\\na\\n\\na\\n\\n.\\na\\n\\na\\n\\n.\\na\\n\\n.\\n\\na\\n\\n.\\n\\na\\n\\n.\\n\\na\\n\\n.\\n\\na\\n\\n.\\n\\na\\n\\n.\\n\\na\\n\\n.\\n\\na\\n\\n.\\n\\na\\n\\n.\\n\\na\\n\\n.\\n\\na\\n\\n.\\n\\na\\n\\n.\\n\\na\\n\\n.\\n\\na\\n\\n.\\n\\na\\n\\n.\\n\\na\\n\\n.\\n\\n.\\n\\na\\n\\n.\\n\\na\\n\\n.\\n\\na\\n\\n.\\n\\n.\\n\\na\\n\\n.\\n\\na\\n\\n.\\n\\n.\\n\\na\\n\\n.\\n\\na\\n\\n.\\n\\n'}]\n"
     ]
    }
   ],
   "source": [
    "# use model\n",
    "pipe = pipeline(\"text-generation\", model=modelA, tokenizer=tokenizerB)\n",
    "print(pipe(\"Hello, how are you?\"))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "fc72ea8a",
   "metadata": {},
   "outputs": [],
   "source": []
  }
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