appendix-A/01_main-chapter-code/exercise-solutions.ipynb

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    "<table style=\"width:100%\">\n",
    "<tr>\n",
    "<td style=\"vertical-align:middle; text-align:left;\">\n",
    "<font size=\"2\">\n",
    "Supplementary code for the <a href=\"http://mng.bz/orYv\">Build a Large Language Model From Scratch</a> book by <a href=\"https://sebastianraschka.com\">Sebastian Raschka</a><br>\n",
    "<br>Code repository: <a href=\"https://github.com/rasbt/LLMs-from-scratch\">https://github.com/rasbt/LLMs-from-scratch</a>\n",
    "<br>汉化的库: <a href=\"https://github.com/GoatCsu/CN-LLMs-from-scratch.git\">https://github.com/GoatCsu/CN-LLMs-from-scratch.git</a>\n",
    "</font>\n",
    "</td>\n",
    "<td style=\"vertical-align:middle; text-align:left;\">\n",
    "<a href=\"http://mng.bz/orYv\"><img src=\"https://sebastianraschka.com/images/LLMs-from-scratch-images/cover-small.webp\" width=\"100px\"></a>\n",
    "</td>\n",
    "</tr>\n",
    "</table>\n"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Exercise A.1"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "本仓库中的[Python设置技巧](../../setup/01_optional-python-setup-preferences/README.md)文档，提供了更多关于设置Python环境的建议和技巧。"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Exercise A.2"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "[本书中使用的库安装文档](../../setup/02_installing-python-libraries/README.md)和[目录](../../setup/02_installing-python-libraries/)包含了检查您的环境是否设置正确的工具。"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Exercise A.3"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [],
   "source": [
    "import torch\n",
    "\n",
    "class NeuralNetwork(torch.nn.Module):\n",
    "    def __init__(self, num_inputs, num_outputs):\n",
    "        super().__init__()\n",
    "\n",
    "        self.layers = torch.nn.Sequential(\n",
    "                \n",
    "            # 1st hidden layer\n",
    "            torch.nn.Linear(num_inputs, 30),\n",
    "            torch.nn.ReLU(),\n",
    "\n",
    "            # 2nd hidden layer\n",
    "            torch.nn.Linear(30, 20),\n",
    "            torch.nn.ReLU(),\n",
    "\n",
    "            # output layer\n",
    "            torch.nn.Linear(20, num_outputs),\n",
    "        )\n",
    "\n",
    "    def forward(self, x):\n",
    "        logits = self.layers(x)\n",
    "        return logits"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Total number of trainable model parameters: 752\n"
     ]
    }
   ],
   "source": [
    "model = NeuralNetwork(2, 2)\n",
    "\n",
    "num_params = sum(p.numel() for p in model.parameters() if p.requires_grad)\n",
    "print(\"Total number of trainable model parameters:\", num_params)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Exercise A.4"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {
    "id": "qGgnamiyLJxp"
   },
   "outputs": [],
   "source": [
    "import torch\n",
    "\n",
    "a = torch.rand(100, 200)\n",
    "b = torch.rand(200, 300)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
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    "colab": {
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    "id": "CvGvIeVkLzXE",
    "outputId": "44d027be-0787-4348-9c06-4e559d94d0e1"
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   "outputs": [
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     "name": "stdout",
     "output_type": "stream",
     "text": [
      "63.8 µs ± 8.7 µs per loop (mean ± std. dev. of 7 runs, 10000 loops each)\n"
     ]
    }
   ],
   "source": [
    "%timeit a @ b"
   ]
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   "cell_type": "code",
   "execution_count": 3,
   "metadata": {
    "id": "OmRtZLa9L2ZG"
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   "source": [
    "a, b = a.to(\"cuda\"), b.to(\"cuda\")"
   ]
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   "cell_type": "code",
   "execution_count": 4,
   "metadata": {
    "colab": {
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     "text": [
      "13.8 µs ± 425 ns per loop (mean ± std. dev. of 7 runs, 100000 loops each)\n"
     ]
    }
   ],
   "source": [
    "%timeit a @ b"
   ]
  }
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