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‎03. numpy/03.04 array types.ipynb.REMOVED.git-id

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713ccb0c837d616e4f75cc49a117c2297179862b
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‎09. theano/09.01 introduction and installation.ipynb

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{
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"cells": [
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"# Theano 简介及其安装"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"# 简介"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"`Theano` 是一个 `Python` 科学计算库，允许我们进行符号运算，并在 `CPU` 和 `GPU` 上执行。\n",
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"\n",
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"它最初由 `Montreal` 大学的机器学习研究者们所开发，用来进行机器学习的计算。\n",
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"\n",
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"按照[官网](http://deeplearning.net/software/theano/)上的说明，它拥有以下几个方面的特点：\n",
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"\n",
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"- 与 **Numpy, Scipy** 的紧密结合\n",
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"- **GPU** 加速\n",
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"- 高效的符号计算\n",
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"- 速度和稳定性\n",
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"- 动态生成 **C** 代码"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"## 使用 anaconda 安装 theano"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"`windows` 下，使用 `anaconda` 安装 `theano` 的命令为：\n",
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"\n",
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" conda install mingw libpython\n",
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" pip install theano\n",
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" \n",
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"`linux` 下，使用 `anaconda` 安装的命令为\n",
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" \n",
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" conda install theano\n",
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"\n",
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"安装好之后，还需要安装 `Cuda` 并进行 `GPU` 环境的配置，否则是不能利用 `GPU` 进行计算的，推荐使用 `linux/mac` 进行配置，具体方法可以参考[官网](http://deeplearning.net/software/theano/)上的配置说明。\n",
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"\n",
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"查看安装的版本："
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]
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},
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{
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"cell_type": "code",
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"execution_count": 1,
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"metadata": {
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"collapsed": false,
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"scrolled": true
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},
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"outputs": [
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{
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"data": {
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"text/plain": [
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"'0.7.0.dev-54186290a97186b9c6b76317e007844529a352f4'"
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]
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},
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"execution_count": 1,
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"metadata": {},
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"output_type": "execute_result"
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}
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],
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"source": [
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"import theano\n",
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"\n",
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"theano.__version__"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"查看当前使用的 device："
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]
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},
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{
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"cell_type": "code",
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"execution_count": 2,
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"metadata": {
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"collapsed": false
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},
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"outputs": [
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{
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"data": {
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"text/plain": [
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"'cpu'"
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]
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},
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"execution_count": 2,
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"metadata": {},
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"output_type": "execute_result"
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}
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],
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"source": [
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"theano.config.device"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"运行测试："
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]
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},
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{
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"cell_type": "code",
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"execution_count": 3,
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"metadata": {
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"collapsed": false
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},
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"outputs": [
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{
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"name": "stderr",
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"output_type": "stream",
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"text": [
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"/usr/local/lib/python2.7/dist-packages/theano/misc/pycuda_init.py:34: UserWarning: PyCUDA import failed in theano.misc.pycuda_init\n",
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" warnings.warn(\"PyCUDA import failed in theano.misc.pycuda_init\")\n",
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"....................S..............."
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]
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},
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"Theano version 0.7.0.dev-54186290a97186b9c6b76317e007844529a352f4\n",
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"theano is installed in /usr/local/lib/python2.7/dist-packages/theano\n",
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"NumPy version 1.10.1\n",
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"NumPy relaxed strides checking option: True\n",
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"NumPy is installed in /usr/lib/python2.7/dist-packages/numpy\n",
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"Python version 2.7.6 (default, Jun 22 2015, 17:58:13) [GCC 4.8.2]\n",
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"nose version 1.3.7\n"
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]
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},
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{
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"name": "stderr",
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"output_type": "stream",
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"text": [
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"\n",
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"----------------------------------------------------------------------\n",
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"Ran 37 tests in 37.919s\n",
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"\n",
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"OK (SKIP=1)\n"
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]
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},
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{
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"data": {
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"text/plain": [
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"<nose.result.TextTestResult run=37 errors=0 failures=0>"
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]
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},
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"execution_count": 3,
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"metadata": {},
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"output_type": "execute_result"
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}
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],
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"source": [
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"theano.test()"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"这里我已经在本地 `Windows` 配好了 `GPU` 的设置，如果没有配好，显示的结果可能不一样。\n",
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"\n",
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"`Windows` 下第一次运行可能会显示 `DEBUG: nvcc STDOUT` 等内容，**`Just ignore it!`**"
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]
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}
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],
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"metadata": {
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"kernelspec": {
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"display_name": "Python 2",
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"language": "python",
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"name": "python2"
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},
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"language_info": {
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"codemirror_mode": {
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"name": "ipython",
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"version": 2
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},
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"file_extension": ".py",
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"mimetype": "text/x-python",
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"name": "python",
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"nbconvert_exporter": "python",
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"pygments_lexer": "ipython2",
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"version": "2.7.6"
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}
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},
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"nbformat": 4,
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"nbformat_minor": 0
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}

‎09. theano/09.01 introduction and installation.ipynb.REMOVED.git-id

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‎09. theano/09.02 theano basics.ipynb.REMOVED.git-id

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‎09. theano/09.03 gpu on windows.ipynb.REMOVED.git-id

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‎09. theano/09.07 softmax on mnist.ipynb.REMOVED.git-id

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‎09. theano/09.08 net.ipynb.REMOVED.git-id

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2a207a309f728f12e5f45faadafde766be259372

‎09. theano/download_mnist.py

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import os
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import os.path
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import urllib
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import gzip
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import shutil
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if not os.path.exists('mnist'):
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os.mkdir('mnist')
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def download_and_gzip(name):
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if not os.path.exists(name + '.gz'):
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urllib.urlretrieve('http://yann.lecun.com/exdb/' + name + '.gz', name + '.gz')
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if not os.path.exists(name):
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with gzip.open(name + '.gz', 'rb') as f_in, open(name, 'wb') as f_out:
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shutil.copyfileobj(f_in, f_out)
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download_and_gzip('mnist/train-images-idx3-ubyte')
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download_and_gzip('mnist/train-labels-idx1-ubyte')
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download_and_gzip('mnist/t10k-images-idx3-ubyte')
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import os
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import os.path
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import urllib
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import gzip
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import shutil
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if not os.path.exists('mnist'):
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os.mkdir('mnist')
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def download_and_gzip(name):
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if not os.path.exists(name + '.gz'):
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urllib.urlretrieve('http://yann.lecun.com/exdb/' + name + '.gz', name + '.gz')
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if not os.path.exists(name):
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with gzip.open(name + '.gz', 'rb') as f_in, open(name, 'wb') as f_out:
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shutil.copyfileobj(f_in, f_out)
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download_and_gzip('mnist/train-images-idx3-ubyte')
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download_and_gzip('mnist/train-labels-idx1-ubyte')
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download_and_gzip('mnist/t10k-images-idx3-ubyte')
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download_and_gzip('mnist/t10k-labels-idx1-ubyte')

‎09. theano/load.py

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import numpy as np
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import os
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datasets_dir = './'
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def one_hot(x,n):
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if type(x) == list:
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x = np.array(x)
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x = x.flatten()
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o_h = np.zeros((len(x),n))
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o_h[np.arange(len(x)),x] = 1
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return o_h
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def mnist(ntrain=60000,ntest=10000,onehot=True):
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data_dir = os.path.join(datasets_dir,'mnist/')
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fd = open(os.path.join(data_dir,'train-images-idx3-ubyte'))
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loaded = np.fromfile(file=fd,dtype=np.uint8)
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trX = loaded[16:].reshape((60000,28*28)).astype(float)
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fd = open(os.path.join(data_dir,'train-labels-idx1-ubyte'))
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loaded = np.fromfile(file=fd,dtype=np.uint8)
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trY = loaded[8:].reshape((60000))
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fd = open(os.path.join(data_dir,'t10k-images-idx3-ubyte'))
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loaded = np.fromfile(file=fd,dtype=np.uint8)
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teX = loaded[16:].reshape((10000,28*28)).astype(float)
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fd = open(os.path.join(data_dir,'t10k-labels-idx1-ubyte'))
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loaded = np.fromfile(file=fd,dtype=np.uint8)
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teY = loaded[8:].reshape((10000))
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trX = trX/255.
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teX = teX/255.
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trX = trX[:ntrain]
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trY = trY[:ntrain]
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teX = teX[:ntest]
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teY = teY[:ntest]
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if onehot:
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trY = one_hot(trY, 10)
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teY = one_hot(teY, 10)
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else:
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trY = np.asarray(trY)
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teY = np.asarray(teY)
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import numpy as np
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import os
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datasets_dir = './'
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def one_hot(x,n):
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if type(x) == list:
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x = np.array(x)
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x = x.flatten()
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o_h = np.zeros((len(x),n))
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o_h[np.arange(len(x)),x] = 1
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return o_h
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def mnist(ntrain=60000,ntest=10000,onehot=True):
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data_dir = os.path.join(datasets_dir,'mnist/')
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fd = open(os.path.join(data_dir,'train-images-idx3-ubyte'))
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loaded = np.fromfile(file=fd,dtype=np.uint8)
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trX = loaded[16:].reshape((60000,28*28)).astype(float)
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fd = open(os.path.join(data_dir,'train-labels-idx1-ubyte'))
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loaded = np.fromfile(file=fd,dtype=np.uint8)
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trY = loaded[8:].reshape((60000))
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fd = open(os.path.join(data_dir,'t10k-images-idx3-ubyte'))
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loaded = np.fromfile(file=fd,dtype=np.uint8)
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teX = loaded[16:].reshape((10000,28*28)).astype(float)
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fd = open(os.path.join(data_dir,'t10k-labels-idx1-ubyte'))
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loaded = np.fromfile(file=fd,dtype=np.uint8)
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teY = loaded[8:].reshape((10000))
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trX = trX/255.
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teX = teX/255.
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trX = trX[:ntrain]
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trY = trY[:ntrain]
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teX = teX[:ntest]
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teY = teY[:ntest]
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if onehot:
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trY = one_hot(trY, 10)
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teY = one_hot(teY, 10)
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else:
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trY = np.asarray(trY)
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teY = np.asarray(teY)
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return trX,teX,trY,teY

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