子曰：

學而不思則罔，思而不學則殆。

因此請思考底下互動程式意欲何為乎？？！！

>>> import mnist_loader
>>> training_data, validation_data, test_data = \
... mnist_loader.load_data_wrapper()
>>> import network
>>> net = network.Network([784, 30, 10])
>>> npzfile = network.np.load("swb.npz")
>>> npzfile.files
['s', 'b2', 'w2', 'w1', 'b1']
>>> net.weights[0] = npzfile["w1"]
>>> net.weights[1] = npzfile["w2"]
>>> net.biases[0] = npzfile["b1"]
>>> net.biases[1] = npzfile["b2"]
>>> net.evaluate(test_data=test_data)
9499
>>> from PIL import Image, ImageDraw, ImageFont
>>> import matplotlib.pyplot as plt


>>> font = ImageFont.truetype("/usr/share/fonts/wqy-zenhei/wqy-zenhei.ttc",28)
>>> im_0 = Image.new("RGB",(28,28))
>>> draw_0 = ImageDraw.Draw(im_0)
>>> draw_0.text((0,0), "0", font=font)
>>> np_im_0 = network.np.asarray(im_0)
>>> plt.imshow(np_im_0,cmap='Greys', interpolation='nearest')
<matplotlib.image.AxesImage object at 0x5466d50>
>>> plt.show()
>>> np_im_0.size
2352

>>> im_0g = im_0.convert('L')
>>> np_im_0g = network.np.asarray(im_0g)
>>> plt.imshow(np_im_0g,cmap='Greys', interpolation='nearest')
<matplotlib.image.AxesImage object at 0x40ba290>
>>> plt.show()
>>> np_im_0g.size
784
>>> np_im_0gc = np_im_0g.reshape(784,1)
>>> net.feedforward(np_im_0gc)
array([[  4.97894890e-13],
       [  3.26055003e-07],
       [  2.68689931e-07],
       [  9.99951724e-01],
       [  6.39075045e-09],
       [  3.00937517e-09],
       [  5.28623209e-13],
       [  9.97879811e-01],
       [  5.07832499e-11],
       [  5.27639416e-17]])
>>> network.np.argmax(net.feedforward(np_im_0gc))
3
>>>

【參考資料】

Image Module

The Image module provides a class with the same name which is used to represent a PIL image. The module also provides a number of factory functions, including functions to load images from files, and to create new images.

from PIL import Image
im = Image.open("bride.jpg")
im.rotate(45).show()

───

ImageFont Module

The ImageFont module defines a class with the same name. Instances of this class store bitmap fonts, and are used with the PIL.ImageDraw.Draw.text() method.

PIL uses its own font file format to store bitmap fonts. You can use the :command`pilfont` utility to convert BDF and PCF font descriptors (X window font formats) to this format.

Starting with version 1.1.4, PIL can be configured to support TrueType and OpenType fonts (as well as other font formats supported by the FreeType library). For earlier versions, TrueType support is only available as part of the imToolkit package

from PIL import ImageFont, ImageDraw

draw = ImageDraw.Draw(image)

# use a bitmap font
font = ImageFont.load("arial.pil")

draw.text((10, 10), "hello", font=font)

# use a truetype font
font = ImageFont.truetype("arial.ttf", 15)

draw.text((10, 25), "world", font=font)

───

ImageDraw Module

The ImageDraw module provide simple 2D graphics for Image objects. You can use this module to create new images, annotate or retouch existing images, and to generate graphics on the fly for web use.

For a more advanced drawing library for PIL, see the aggdraw module.

from PIL import Image, ImageDraw

im = Image.open("lena.pgm")

draw = ImageDraw.Draw(im)
draw.line((0, 0) + im.size, fill=128)
draw.line((0, im.size[1], im.size[0], 0), fill=128)
del draw

# write to stdout
im.save(sys.stdout, "PNG")