|
| 1 | +{ |
| 2 | + "cells": [ |
| 3 | + { |
| 4 | + "cell_type": "markdown", |
| 5 | + "metadata": {}, |
| 6 | + "source": [ |
| 7 | + "#### 1. 定义两个不同的图" |
| 8 | + ] |
| 9 | + }, |
| 10 | + { |
| 11 | + "cell_type": "code", |
| 12 | + "execution_count": 1, |
| 13 | + "metadata": {}, |
| 14 | + "outputs": [ |
| 15 | + { |
| 16 | + "name": "stdout", |
| 17 | + "output_type": "stream", |
| 18 | + "text": [ |
| 19 | + "[ 0.]\n", |
| 20 | + "[ 1.]\n" |
| 21 | + ] |
| 22 | + } |
| 23 | + ], |
| 24 | + "source": [ |
| 25 | + "import tensorflow as tf\n", |
| 26 | + "\n", |
| 27 | + "g1 = tf.Graph()\n", |
| 28 | + "with g1.as_default():\n", |
| 29 | + " v = tf.get_variable(\"v\", [1], initializer = tf.zeros_initializer()) # 设置初始值为0\n", |
| 30 | + "\n", |
| 31 | + "g2 = tf.Graph()\n", |
| 32 | + "with g2.as_default():\n", |
| 33 | + " v = tf.get_variable(\"v\", [1], initializer = tf.ones_initializer()) # 设置初始值为1\n", |
| 34 | + " \n", |
| 35 | + "with tf.Session(graph = g1) as sess:\n", |
| 36 | + " tf.global_variables_initializer().run()\n", |
| 37 | + " with tf.variable_scope(\"\", reuse=True):\n", |
| 38 | + " print(sess.run(tf.get_variable(\"v\")))\n", |
| 39 | + "\n", |
| 40 | + "with tf.Session(graph = g2) as sess:\n", |
| 41 | + " tf.global_variables_initializer().run()\n", |
| 42 | + " with tf.variable_scope(\"\", reuse=True):\n", |
| 43 | + " print(sess.run(tf.get_variable(\"v\")))" |
| 44 | + ] |
| 45 | + }, |
| 46 | + { |
| 47 | + "cell_type": "markdown", |
| 48 | + "metadata": { |
| 49 | + "collapsed": true |
| 50 | + }, |
| 51 | + "source": [ |
| 52 | + "#### 2. 张量的概念" |
| 53 | + ] |
| 54 | + }, |
| 55 | + { |
| 56 | + "cell_type": "code", |
| 57 | + "execution_count": 2, |
| 58 | + "metadata": {}, |
| 59 | + "outputs": [ |
| 60 | + { |
| 61 | + "name": "stdout", |
| 62 | + "output_type": "stream", |
| 63 | + "text": [ |
| 64 | + "Tensor(\"add:0\", shape=(2,), dtype=float32)\n", |
| 65 | + "[ 3. 5.]\n" |
| 66 | + ] |
| 67 | + } |
| 68 | + ], |
| 69 | + "source": [ |
| 70 | + "import tensorflow as tf\n", |
| 71 | + "a = tf.constant([1.0, 2.0], name=\"a\")\n", |
| 72 | + "b = tf.constant([2.0, 3.0], name=\"b\")\n", |
| 73 | + "result = a + b\n", |
| 74 | + "print result\n", |
| 75 | + "\n", |
| 76 | + "sess = tf.InteractiveSession ()\n", |
| 77 | + "print(result.eval())\n", |
| 78 | + "sess.close()" |
| 79 | + ] |
| 80 | + }, |
| 81 | + { |
| 82 | + "cell_type": "markdown", |
| 83 | + "metadata": {}, |
| 84 | + "source": [ |
| 85 | + "#### 3. 会话的使用" |
| 86 | + ] |
| 87 | + }, |
| 88 | + { |
| 89 | + "cell_type": "markdown", |
| 90 | + "metadata": {}, |
| 91 | + "source": [ |
| 92 | + "3.1 创建和关闭会话" |
| 93 | + ] |
| 94 | + }, |
| 95 | + { |
| 96 | + "cell_type": "code", |
| 97 | + "execution_count": 3, |
| 98 | + "metadata": {}, |
| 99 | + "outputs": [ |
| 100 | + { |
| 101 | + "name": "stdout", |
| 102 | + "output_type": "stream", |
| 103 | + "text": [ |
| 104 | + "[ 3. 5.]\n" |
| 105 | + ] |
| 106 | + } |
| 107 | + ], |
| 108 | + "source": [ |
| 109 | + "# 创建一个会话。\n", |
| 110 | + "sess = tf.Session()\n", |
| 111 | + "\n", |
| 112 | + "# 使用会话得到之前计算的结果。\n", |
| 113 | + "print(sess.run(result))\n", |
| 114 | + "\n", |
| 115 | + "# 关闭会话使得本次运行中使用到的资源可以被释放。\n", |
| 116 | + "sess.close()" |
| 117 | + ] |
| 118 | + }, |
| 119 | + { |
| 120 | + "cell_type": "markdown", |
| 121 | + "metadata": {}, |
| 122 | + "source": [ |
| 123 | + "3.2 使用with statement 来创建会话" |
| 124 | + ] |
| 125 | + }, |
| 126 | + { |
| 127 | + "cell_type": "code", |
| 128 | + "execution_count": 4, |
| 129 | + "metadata": {}, |
| 130 | + "outputs": [ |
| 131 | + { |
| 132 | + "name": "stdout", |
| 133 | + "output_type": "stream", |
| 134 | + "text": [ |
| 135 | + "[ 3. 5.]\n" |
| 136 | + ] |
| 137 | + } |
| 138 | + ], |
| 139 | + "source": [ |
| 140 | + "with tf.Session() as sess:\n", |
| 141 | + " print(sess.run(result))" |
| 142 | + ] |
| 143 | + }, |
| 144 | + { |
| 145 | + "cell_type": "markdown", |
| 146 | + "metadata": {}, |
| 147 | + "source": [ |
| 148 | + "3.3 指定默认会话" |
| 149 | + ] |
| 150 | + }, |
| 151 | + { |
| 152 | + "cell_type": "code", |
| 153 | + "execution_count": 5, |
| 154 | + "metadata": {}, |
| 155 | + "outputs": [ |
| 156 | + { |
| 157 | + "name": "stdout", |
| 158 | + "output_type": "stream", |
| 159 | + "text": [ |
| 160 | + "[ 3. 5.]\n" |
| 161 | + ] |
| 162 | + } |
| 163 | + ], |
| 164 | + "source": [ |
| 165 | + "sess = tf.Session()\n", |
| 166 | + "with sess.as_default():\n", |
| 167 | + " print(result.eval())" |
| 168 | + ] |
| 169 | + }, |
| 170 | + { |
| 171 | + "cell_type": "code", |
| 172 | + "execution_count": 6, |
| 173 | + "metadata": {}, |
| 174 | + "outputs": [ |
| 175 | + { |
| 176 | + "name": "stdout", |
| 177 | + "output_type": "stream", |
| 178 | + "text": [ |
| 179 | + "[ 3. 5.]\n", |
| 180 | + "[ 3. 5.]\n" |
| 181 | + ] |
| 182 | + } |
| 183 | + ], |
| 184 | + "source": [ |
| 185 | + "sess = tf.Session()\n", |
| 186 | + "\n", |
| 187 | + "# 下面的两个命令有相同的功能。\n", |
| 188 | + "print(sess.run(result))\n", |
| 189 | + "print(result.eval(session=sess))" |
| 190 | + ] |
| 191 | + }, |
| 192 | + { |
| 193 | + "cell_type": "markdown", |
| 194 | + "metadata": {}, |
| 195 | + "source": [ |
| 196 | + "#### 4. 使用tf.InteractiveSession构建会话" |
| 197 | + ] |
| 198 | + }, |
| 199 | + { |
| 200 | + "cell_type": "code", |
| 201 | + "execution_count": 7, |
| 202 | + "metadata": {}, |
| 203 | + "outputs": [ |
| 204 | + { |
| 205 | + "name": "stdout", |
| 206 | + "output_type": "stream", |
| 207 | + "text": [ |
| 208 | + "[ 3. 5.]\n" |
| 209 | + ] |
| 210 | + } |
| 211 | + ], |
| 212 | + "source": [ |
| 213 | + "sess = tf.InteractiveSession ()\n", |
| 214 | + "print(result.eval())\n", |
| 215 | + "sess.close()" |
| 216 | + ] |
| 217 | + }, |
| 218 | + { |
| 219 | + "cell_type": "markdown", |
| 220 | + "metadata": {}, |
| 221 | + "source": [ |
| 222 | + "#### 5. 通过ConfigProto配置会话" |
| 223 | + ] |
| 224 | + }, |
| 225 | + { |
| 226 | + "cell_type": "code", |
| 227 | + "execution_count": 8, |
| 228 | + "metadata": { |
| 229 | + "collapsed": true |
| 230 | + }, |
| 231 | + "outputs": [], |
| 232 | + "source": [ |
| 233 | + "config=tf.ConfigProto(allow_soft_placement=True, log_device_placement=True)\n", |
| 234 | + "sess1 = tf.InteractiveSession(config=config)\n", |
| 235 | + "sess2 = tf.Session(config=config)" |
| 236 | + ] |
| 237 | + } |
| 238 | + ], |
| 239 | + "metadata": { |
| 240 | + "kernelspec": { |
| 241 | + "display_name": "Python 2", |
| 242 | + "language": "python", |
| 243 | + "name": "python2" |
| 244 | + }, |
| 245 | + "language_info": { |
| 246 | + "codemirror_mode": { |
| 247 | + "name": "ipython", |
| 248 | + "version": 2 |
| 249 | + }, |
| 250 | + "file_extension": ".py", |
| 251 | + "mimetype": "text/x-python", |
| 252 | + "name": "python", |
| 253 | + "nbconvert_exporter": "python", |
| 254 | + "pygments_lexer": "ipython2", |
| 255 | + "version": "2.7.13" |
| 256 | + } |
| 257 | + }, |
| 258 | + "nbformat": 4, |
| 259 | + "nbformat_minor": 1 |
| 260 | +} |
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