notebook-examples/chapter-3/tensor.ipynb

{
 "cells": [
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {},
   "outputs": [],
   "source": [
    "import tensorflow as tf"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [],
   "source": [
    "# 0阶张量\n",
    "mammal = tf.Variable(\"Elephant\", tf.string)\n",
    "ignition = tf.Variable(451, tf.int16)\n",
    "floating = tf.Variable(3.14159265359, tf.float64)\n",
    "its_complicated = tf.Variable(12.3 - 4.85j, tf.complex64)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "[<tf.Variable 'Variable:0' shape=() dtype=string_ref>,\n",
       " <tf.Variable 'Variable_1:0' shape=() dtype=int32_ref>,\n",
       " <tf.Variable 'Variable_2:0' shape=() dtype=float32_ref>,\n",
       " <tf.Variable 'Variable_3:0' shape=() dtype=complex128_ref>]"
      ]
     },
     "execution_count": 3,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "[mammal, ignition, floating, its_complicated]"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {},
   "outputs": [],
   "source": [
    "# 1阶张量\n",
    "mystr = tf.Variable([\"Hello\", \"World\"], tf.string)\n",
    "cool_numbers  = tf.Variable([3.14159, 2.71828], tf.float32)\n",
    "first_primes = tf.Variable([2, 3, 5, 7, 11], tf.int32)\n",
    "its_very_complicated = tf.Variable([12.3 - 4.85j, 7.5 - 6.23j], tf.complex64)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "[<tf.Variable 'Variable_8:0' shape=(2,) dtype=string_ref>,\n",
       " <tf.Variable 'Variable_9:0' shape=(2,) dtype=float32_ref>,\n",
       " <tf.Variable 'Variable_10:0' shape=(5,) dtype=int32_ref>,\n",
       " <tf.Variable 'Variable_11:0' shape=(2,) dtype=complex128_ref>]"
      ]
     },
     "execution_count": 6,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "[mystr, cool_numbers, first_primes, its_very_complicated]"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "metadata": {},
   "outputs": [],
   "source": [
    "# 2阶张量\n",
    "mymat = tf.Variable([[7],[11]], tf.int16)\n",
    "myxor = tf.Variable([[False, True],[True, False]], tf.bool)\n",
    "linear_squares = tf.Variable([[4], [9], [16], [25]], tf.int32)\n",
    "squarish_squares = tf.Variable([ [4, 9], [16, 25] ], tf.int32)\n",
    "rank_of_squares = tf.rank(squarish_squares)\n",
    "mymatC = tf.Variable([[7],[11]], tf.int32)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 8,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "[<tf.Variable 'Variable_12:0' shape=(2, 1) dtype=int32_ref>,\n",
       " <tf.Variable 'Variable_13:0' shape=(2, 2) dtype=bool_ref>,\n",
       " <tf.Variable 'Variable_14:0' shape=(4, 1) dtype=int32_ref>,\n",
       " <tf.Variable 'Variable_15:0' shape=(2, 2) dtype=int32_ref>,\n",
       " <tf.Tensor 'Rank:0' shape=() dtype=int32>,\n",
       " <tf.Variable 'Variable_16:0' shape=(2, 1) dtype=int32_ref>]"
      ]
     },
     "execution_count": 8,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "[mymat, myxor, linear_squares, squarish_squares, rank_of_squares, mymatC]"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 9,
   "metadata": {},
   "outputs": [],
   "source": [
    "# 4阶张量\n",
    "my_image = tf.zeros([10, 299, 299, 3])  # batch x height x width x color"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 10,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "<tf.Tensor 'zeros:0' shape=(10, 299, 299, 3) dtype=float32>"
      ]
     },
     "execution_count": 10,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "my_image"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  }
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