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simple-3layer-perceptron-3images.py
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simple-3layer-perceptron-3images.py
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# -*- coding: utf-8 -*-
import argparse
import numpy as np
import chainer
from chainer import cuda, Function, gradient_check, report, training, utils, Variable
from chainer import datasets, iterators, optimizers, serializers
from chainer import Link, Chain, ChainList
import chainer.functions as F
import chainer.links as L
from chainer.training import extensions
import cv2
#from matplotlib import pylab as plt
# Network definition
class MLP(chainer.Chain):
def __init__(self, n_in, n_units, n_out):
super(MLP, self).__init__(
l1=L.Linear(n_in, n_units), # first layer
l2=L.Linear(n_units, n_units), # second layer
l3=L.Linear(n_units, n_out), # output layer
)
def __call__(self, x):
h1 = F.relu(self.l1(x))
h2 = F.relu(self.l2(h1))
return self.l3(h2)
def main():
parser = argparse.ArgumentParser(description='Chainer example: MNIST')
parser.add_argument('--batchsize', '-b', type=int, default=1,
help='Number of images in each mini batch')
parser.add_argument('--epoch', '-e', type=int, default=100,
help='Number of sweeps over the dataset to train')
parser.add_argument('--gpu', '-g', type=int, default=-1,
help='GPU ID (negative value indicates CPU)')
parser.add_argument('--out', '-o', default='result',
help='Directory to output the result')
parser.add_argument('--resume', '-r', default='',
help='Resume the training from snapshot')
parser.add_argument('--unit', '-u', type=int, default=10,
help='Number of units')
args = parser.parse_args()
# load a color image
img1 = cv2.imread('images/zero.jpg', cv2.IMREAD_COLOR)
img2 = cv2.imread('images/black.jpg', cv2.IMREAD_COLOR)
img3 = cv2.imread('images/white.jpg', cv2.IMREAD_COLOR)
# color -> grayscale
imggray1 = cv2.cvtColor(img1, cv2.COLOR_RGB2GRAY)
imggray2 = cv2.cvtColor(img2, cv2.COLOR_RGB2GRAY)
imggray3 = cv2.cvtColor(img3, cv2.COLOR_RGB2GRAY)
# image -> array
gray = []
for y in range(len(imggray1)):
for x in range(len(imggray1[y])):
gray.append(imggray1[y][x])
imgdata1 = np.array(gray, dtype='f')
imgdata1 = imgdata1.reshape(1, 1, 32, 32)
imgdata1 = imgdata1 / 255.0
gray = []
for y in range(len(imggray2)):
for x in range(len(imggray2[y])):
gray.append(imggray2[y][x])
imgdata2 = np.array(gray, dtype='f')
imgdata2 = imgdata2.reshape(1, 1, 32, 32)
imgdata2 = imgdata2 / 255.0
gray = []
for y in range(len(imggray3)):
for x in range(len(imggray3[y])):
gray.append(imggray3[y][x])
imgdata3 = np.array(gray, dtype='f')
imgdata3 = imgdata3.reshape(1, 1, 32, 32)
imgdata3 = imgdata3 / 255.0
n_in = 32*32
print('GPU: {}'.format(args.gpu))
print('# unit: {}'.format(args.unit))
print('# Minibatch-size: {}'.format(args.batchsize))
print('# epoch: {}'.format(args.epoch))
print('')
model = L.Classifier(MLP(n_in, args.unit, 3))
# Setup an optimizer
optimizer = chainer.optimizers.Adam()
optimizer.setup(model)
# Load dataset
x1 = imgdata1
x2 = imgdata2
x3 = imgdata3
y1 = np.array(0, dtype=np.int32)
y2 = np.array(1, dtype=np.int32)
y3 = np.array(2, dtype=np.int32)
dd = [(x1, y1), (x2, y2), (x3, y3)]
train, test = dd, dd
train_iter = chainer.iterators.SerialIterator(train, args.batchsize)
test_iter = chainer.iterators.SerialIterator(test, args.batchsize,
repeat=False, shuffle=False)
# Set up a trainer
updater = training.StandardUpdater(train_iter, optimizer, device=args.gpu)
trainer = training.Trainer(updater, (args.epoch, 'epoch'), out=args.out)
# Evaluate the model with the test dataset for each epoch
trainer.extend(extensions.Evaluator(test_iter, model, device=args.gpu))
# Dump a computational graph from 'loss' variable at the first iteration
# The "main" refers to the target link of the "main" optimizer.
trainer.extend(extensions.dump_graph('main/loss'))
# Take a snapshot at each epoch
trainer.extend(extensions.snapshot())
# Write a log of evaluation statistics for each epoch
trainer.extend(extensions.LogReport())
# Print selected entries of the log to stdout
# Here "main" refers to the target link of the "main" optimizer again, and
# "validation" refers to the default name of the Evaluator extension.
# Entries other than 'epoch' are reported by the Classifier link, called by
# either the updater or the evaluator.
trainer.extend(extensions.PrintReport(
['epoch', 'main/loss', 'validation/main/loss',
'main/accuracy', 'validation/main/accuracy']))
# Print a progress bar to stdout
trainer.extend(extensions.ProgressBar())
# Resume from a snapshot
#chainer.serializers.load_npz(resume, trainer)
# Run the training
trainer.run()
if __name__ == '__main__':
main()