import theano 导入失败的解决方法（+function用法）

1、>>> import theano  

WARNING (theano.configdefaults): g++not available, if using conda: `conda install m2w64-toolchain` WARNING (theano.configdefaults): g++not detected ! Theano will be unable to execute optimized C- imp

解决方法：

键入命令解决：conda install m2w64-toolchain

2、import theano 失败解决方法：

问题的解决方案就是安装libpython
查看conda list
如果没有libpython
然后输入一句命令：

conda install libpython

然后

import theano

成功！

"""
python3.6
"""
import numpy as np
import theano.tensor as T
from theano import function


x = T.dscalar('x')
y = T.dscalar('y')
z = x+y     # define the actual function in here
f = function([x, y], z)  # the inputs are in [], and the output in the "z"
# def f(x,y):
#     return x+y
print(f(2,3))  # 输出2与3的和

# to pretty-print the function
from theano import pp 
print(pp(z))

# how about matrix
x = T.dmatrix('x')
y = T.dmatrix('y')
z = x + y # 矩阵积 z = T.dot(x,y)
f = function([x, y], z)
print(f(np.arange(12).reshape((3,4)), 10*np.ones((3,4))))