コード例 #1
0
def LogisticRegression_demo(learning_rate=0.13, n_epochs=1000, dataset='mnist.pkl.gz', batch_size=600):
    datasets = load_multi()

    train_set_x, train_set_y = datasets[0]
    valid_set_x, valid_set_y = datasets[1]
    test_set_x, test_set_y = datasets[2]

    n_train_batches = train_set_x.get_value(borrow=True).shape[0] / batch_size
    n_valid_batches = valid_set_x.get_value(borrow=True).shape[0] / batch_size
    n_test_batches = test_set_x.get_value(borrow=True).shape[0] / batch_size
    
    print '... building the model'

    
    index = T.lscalar()  
    x = T.matrix('x') 
    y = T.ivector('y')  

    classifier = LogisticRegression(x, y, n_in=103, n_out=9)
    
    test_model = theano.function(inputs=[index],
                                 outputs=classifier.errors(),
                                 givens={x: test_set_x[index * batch_size: (index + 1) * batch_size],
                                         y: test_set_y[index * batch_size: (index + 1) * batch_size]})
                                         
    validate_model = theano.function(inputs=[index],
                                     outputs=classifier.errors(),
                                     givens={x: valid_set_x[index * batch_size:(index + 1) * batch_size],
                                             y: valid_set_y[index * batch_size:(index + 1) * batch_size]})
                                             
    cost, updates = classifier.get_cost_updates(learning_rate=learning_rate)
    
    train_model = theano.function(inputs=[index],
                                  outputs=cost,
                                  updates=updates,
                                  givens={x: train_set_x[index * batch_size:(index + 1) * batch_size],
                                          y: train_set_y[index * batch_size:(index + 1) * batch_size]})
                                          
    print '... training the model'
    
    patience = 5000  
    patience_increase = 2  
                                  
    improvement_threshold = 0.995  
    validation_frequency = min(n_train_batches, patience / 2)

    best_validation_loss = numpy.inf
    test_score = 0.
    start_time = time.clock()

    done_looping = False
    epoch = 0
    while (epoch < n_epochs) and (not done_looping):
        epoch = epoch + 1
        for minibatch_index in xrange(n_train_batches):

            train_model(minibatch_index)
            iter = (epoch - 1) * n_train_batches + minibatch_index

            if (iter + 1) % validation_frequency == 0:
                validation_losses = [validate_model(i)
                                     for i in xrange(n_valid_batches)]
                this_validation_loss = numpy.mean(validation_losses)

                print('epoch %i, minibatch %i/%i, validation error %f %%' % \
                    (epoch, minibatch_index + 1, n_train_batches,
                    this_validation_loss * 100.))

                if this_validation_loss < best_validation_loss:
                    if this_validation_loss < best_validation_loss *  \
                       improvement_threshold:
                        patience = max(patience, iter * patience_increase)

                    best_validation_loss = this_validation_loss

                    test_losses = [test_model(i)
                                   for i in xrange(n_test_batches)]
                    test_score = numpy.mean(test_losses)

                    print(('     epoch %i, minibatch %i/%i, test error of best'
                       ' model %f %%') %
                        (epoch, minibatch_index + 1, n_train_batches,
                         test_score * 100.))

            if patience <= iter:
                done_looping = True
                break

    end_time = time.clock()
    print(('Optimization complete with best validation score of %f %%,'
           'with test performance %f %%') %
                 (best_validation_loss * 100., test_score * 100.))
    print 'The code run for %d epochs, with %f epochs/sec' % (
        epoch, 1. * epoch / (end_time - start_time))
    print >> sys.stderr, ('The code for file ' +
                          os.path.split(__file__)[1] +
                          ' ran for %.1fs' % ((end_time - start_time)))
コード例 #2
0
def MLP_demo(learning_rate=0.01,
             L1_reg=0.00,
             L2_reg=0.0001,
             n_epochs=1000,
             dataset='mnist.pkl.gz',
             batch_size=1,
             n_hidden=309):
    datasets = load_multi()

    train_set_x, train_set_y = datasets[0]
    valid_set_x, valid_set_y = datasets[1]
    test_set_x, test_set_y = datasets[2]

    n_train_batches = train_set_x.get_value(borrow=True).shape[0] / batch_size
    n_valid_batches = valid_set_x.get_value(borrow=True).shape[0] / batch_size
    n_test_batches = test_set_x.get_value(borrow=True).shape[0] / batch_size

    print '... building the model'

    index = T.lscalar()
    x = T.matrix('x')
    y = T.ivector('y')

    rng = np.random.RandomState(1234)

    classifier = MLP(rng, x, y, n_in=103, n_hidden=n_hidden, n_out=9)

    test_model = theano.function(
        inputs=[index],
        outputs=classifier.errors(),
        givens={
            x: test_set_x[index * batch_size:(index + 1) * batch_size],
            y: test_set_y[index * batch_size:(index + 1) * batch_size]
        })

    validate_model = theano.function(
        inputs=[index],
        outputs=classifier.errors(),
        givens={
            x: valid_set_x[index * batch_size:(index + 1) * batch_size],
            y: valid_set_y[index * batch_size:(index + 1) * batch_size]
        })

    cost, updates = classifier.get_cost_updates(learning_rate=learning_rate,
                                                L1_reg=L1_reg,
                                                L2_reg=L2_reg)
    train_model = theano.function(
        inputs=[index],
        outputs=cost,
        updates=updates,
        givens={
            x: train_set_x[index * batch_size:(index + 1) * batch_size],
            y: train_set_y[index * batch_size:(index + 1) * batch_size]
        })

    print '... training'

    patience = 10000
    patience_increase = 2
    improvement_threshold = 0.995
    validation_frequency = min(n_train_batches, patience / 2)

    best_validation_loss = np.inf
    best_iter = 0
    test_score = 0.
    start_time = time.clock()

    epoch = 0
    done_looping = False

    while (epoch < n_epochs) and (not done_looping):
        epoch = epoch + 1
        for minibatch_index in xrange(n_train_batches):
            train_model(minibatch_index)

            iter = (epoch - 1) * n_train_batches + minibatch_index

            if (iter + 1) % validation_frequency == 0:

                validation_losses = [
                    validate_model(i) for i in xrange(n_valid_batches)
                ]
                this_validation_loss = np.mean(validation_losses)

                print('epoch %i, minibatch %i/%i, validation error %f %%' %
                      (epoch, minibatch_index + 1, n_train_batches,
                       this_validation_loss * 100.))

                if this_validation_loss < best_validation_loss:

                    if this_validation_loss < best_validation_loss * improvement_threshold:
                        patience = max(patience, iter * patience_increase)

                    best_validation_loss = this_validation_loss
                    best_iter = iter

                    test_losses = [
                        test_model(i) for i in xrange(n_test_batches)
                    ]
                    test_score = np.mean(test_losses)

                    print(('     epoch %i, minibatch %i/%i, test error of '
                           'best model %f %%') %
                          (epoch, minibatch_index + 1, n_train_batches,
                           test_score * 100.))

            if patience <= iter:
                done_looping = True
                break

    end_time = time.clock()
    print(('Optimization complete. Best validation score of %f %% '
           'obtained at iteration %i, with test performance %f %%') %
          (best_validation_loss * 100., best_iter + 1, test_score * 100.))
    print >> sys.stderr, ('The code for file ' + os.path.split(__file__)[1] +
                          ' ran for %.2fm' % ((end_time - start_time) / 60.))
コード例 #3
0
def LogisticRegression_demo(learning_rate=0.13,
                            n_epochs=1000,
                            dataset='mnist.pkl.gz',
                            batch_size=600):
    datasets = load_multi()

    train_set_x, train_set_y = datasets[0]
    valid_set_x, valid_set_y = datasets[1]
    test_set_x, test_set_y = datasets[2]

    n_train_batches = train_set_x.get_value(borrow=True).shape[0] / batch_size
    n_valid_batches = valid_set_x.get_value(borrow=True).shape[0] / batch_size
    n_test_batches = test_set_x.get_value(borrow=True).shape[0] / batch_size

    print '... building the model'

    index = T.lscalar()
    x = T.matrix('x')
    y = T.ivector('y')

    classifier = LogisticRegression(x, y, n_in=103, n_out=9)

    test_model = theano.function(
        inputs=[index],
        outputs=classifier.errors(),
        givens={
            x: test_set_x[index * batch_size:(index + 1) * batch_size],
            y: test_set_y[index * batch_size:(index + 1) * batch_size]
        })

    validate_model = theano.function(
        inputs=[index],
        outputs=classifier.errors(),
        givens={
            x: valid_set_x[index * batch_size:(index + 1) * batch_size],
            y: valid_set_y[index * batch_size:(index + 1) * batch_size]
        })

    cost, updates = classifier.get_cost_updates(learning_rate=learning_rate)

    train_model = theano.function(
        inputs=[index],
        outputs=cost,
        updates=updates,
        givens={
            x: train_set_x[index * batch_size:(index + 1) * batch_size],
            y: train_set_y[index * batch_size:(index + 1) * batch_size]
        })

    print '... training the model'

    patience = 5000
    patience_increase = 2

    improvement_threshold = 0.995
    validation_frequency = min(n_train_batches, patience / 2)

    best_validation_loss = numpy.inf
    test_score = 0.
    start_time = time.clock()

    done_looping = False
    epoch = 0
    while (epoch < n_epochs) and (not done_looping):
        epoch = epoch + 1
        for minibatch_index in xrange(n_train_batches):

            train_model(minibatch_index)
            iter = (epoch - 1) * n_train_batches + minibatch_index

            if (iter + 1) % validation_frequency == 0:
                validation_losses = [
                    validate_model(i) for i in xrange(n_valid_batches)
                ]
                this_validation_loss = numpy.mean(validation_losses)

                print('epoch %i, minibatch %i/%i, validation error %f %%' % \
                    (epoch, minibatch_index + 1, n_train_batches,
                    this_validation_loss * 100.))

                if this_validation_loss < best_validation_loss:
                    if this_validation_loss < best_validation_loss *  \
                       improvement_threshold:
                        patience = max(patience, iter * patience_increase)

                    best_validation_loss = this_validation_loss

                    test_losses = [
                        test_model(i) for i in xrange(n_test_batches)
                    ]
                    test_score = numpy.mean(test_losses)

                    print(('     epoch %i, minibatch %i/%i, test error of best'
                           ' model %f %%') %
                          (epoch, minibatch_index + 1, n_train_batches,
                           test_score * 100.))

            if patience <= iter:
                done_looping = True
                break

    end_time = time.clock()
    print(('Optimization complete with best validation score of %f %%,'
           'with test performance %f %%') %
          (best_validation_loss * 100., test_score * 100.))
    print 'The code run for %d epochs, with %f epochs/sec' % (
        epoch, 1. * epoch / (end_time - start_time))
    print >> sys.stderr, ('The code for file ' + os.path.split(__file__)[1] +
                          ' ran for %.1fs' % ((end_time - start_time)))
コード例 #4
0
def StackedAutoEncoders_demo(finetune_lr=0.1, pretraining_epochs=10, pretrain_lr=0.001, training_epochs=1000, 
                             dataset='mnist.pkl.gz', batch_size=20, pretrain_flag=True, finetuning_flag=True):
    
    datasets = load_multi()

    train_set_x, train_set_y = datasets[0]
    valid_set_x, valid_set_y = datasets[1]
    test_set_x, test_set_y = datasets[2]

    n_train_batches = train_set_x.get_value(borrow=True).shape[0]
    n_train_batches /= batch_size
    
    numpy_rng = np.random.RandomState(89677)
    print '... building the model'
    
    sda = StackedAutoEncoders(numpy_rng, n_ins=103, hidden_layer_sizes=[309, 309, 309], n_outs=9)
  
  
    #########################
    # PRETRAINING THE MODEL #
    #########################
    if pretrain_flag == True:
        print '... getting the pretraining functions'
        pretraining_fns = sda.pretraining_functions(train_set_x, batch_size)
        start_time = time.clock()
    
        print '... pre-training the model'
    
        corruption_levels = [.1, .2, .3]
        for i in xrange(sda.n_layers):
        
            for epoch in xrange(pretraining_epochs):
            
                c = []
                for batch_index in xrange(n_train_batches):
                    c.append(pretraining_fns[i](index=batch_index,
                             corruption=corruption_levels[i],
                             lr=pretrain_lr))
                print 'Pre-training layer %i, epoch %d, cost ' % (i, epoch),
                print np.mean(c)

        end_time = time.clock()
        print >> sys.stderr, ('The pretraining code for file ' +
                              os.path.split(__file__)[1] +
                              ' ran for %.2fm' % ((end_time - start_time) / 60.))
                              
    else:
        print '... pretraining skipped'
  
    ########################
    # FINETUNING THE MODEL #
    ########################
    if finetuning_flag == True:
        print '... getting the finetuning functions'
        train_fn, validate_model, test_model = sda.finetuning_functions(datasets, batch_size, finetune_lr)

        print '... finetunning the model'
        patience = 10 * n_train_batches  
        patience_increase = 2. 
        improvement_threshold = 0.995  
        validation_frequency = min(n_train_batches, patience / 2)
                                  
        best_validation_loss = np.inf
        test_score = 0.
        start_time = time.clock()

        done_looping = False
        epoch = 0

        while (epoch < training_epochs) and (not done_looping):
            epoch = epoch + 1
            for minibatch_index in xrange(n_train_batches):
                train_fn(minibatch_index)
                iter = (epoch - 1) * n_train_batches + minibatch_index

                if (iter + 1) % validation_frequency == 0:
                    validation_losses = validate_model()
                    this_validation_loss = np.mean(validation_losses)
                    print('epoch %i, minibatch %i/%i, validation error %f %%' %
                          (epoch, minibatch_index + 1, n_train_batches,
                           this_validation_loss * 100.))

                    if this_validation_loss < best_validation_loss:
                    
                        if (this_validation_loss < best_validation_loss *
                            improvement_threshold):
                                patience = max(patience, iter * patience_increase)
                        
                        best_validation_loss = this_validation_loss

                        test_losses = test_model()
                        test_score = np.mean(test_losses)
                        print(('     epoch %i, minibatch %i/%i, test error of '
                               'best model %f %%') %
                               (epoch, minibatch_index + 1, n_train_batches,
                                test_score * 100.))

                if patience <= iter:
                    done_looping = True
                    break

        end_time = time.clock()
        print(('Optimization complete with best validation score of %f %%,'
               'with test performance %f %%') %
               (best_validation_loss * 100., test_score * 100.))
        print >> sys.stderr, ('The training code for file ' +
                              os.path.split(__file__)[1] +
                              ' ran for %.2fm' % ((end_time - start_time) / 60.))
    else:
        print '... finetuning skipped'
                      
    return sda
コード例 #5
0
def MLP_demo(learning_rate=0.01, L1_reg=0.00, L2_reg=0.0001, n_epochs=1000, dataset='mnist.pkl.gz', batch_size=1, n_hidden=309):
    datasets = load_multi()

    train_set_x, train_set_y = datasets[0]
    valid_set_x, valid_set_y = datasets[1]
    test_set_x, test_set_y = datasets[2]

    n_train_batches = train_set_x.get_value(borrow=True).shape[0] / batch_size
    n_valid_batches = valid_set_x.get_value(borrow=True).shape[0] / batch_size
    n_test_batches = test_set_x.get_value(borrow=True).shape[0] / batch_size

    print '... building the model'
    
    index = T.lscalar()  
    x = T.matrix('x')  
    y = T.ivector('y') 
    
    rng = np.random.RandomState(1234)

    classifier = MLP(rng, x, y, n_in=103, n_hidden=n_hidden, n_out=9)
    
    test_model = theano.function(inputs=[index],
                                 outputs=classifier.errors(),
                                 givens={x: test_set_x[index * batch_size:(index + 1) * batch_size],
                                         y: test_set_y[index * batch_size:(index + 1) * batch_size]})

    validate_model = theano.function(inputs=[index],
                                     outputs=classifier.errors(),
                                     givens={x: valid_set_x[index * batch_size:(index + 1) * batch_size],
                                             y: valid_set_y[index * batch_size:(index + 1) * batch_size]})

    cost, updates = classifier.get_cost_updates(learning_rate=learning_rate, L1_reg=L1_reg, L2_reg=L2_reg)
    train_model = theano.function(inputs=[index], 
                                  outputs=cost,
                                  updates=updates,
                                  givens={x: train_set_x[index * batch_size:(index + 1) * batch_size],
                                          y: train_set_y[index * batch_size:(index + 1) * batch_size]})
    
    print '... training'

    patience = 10000  
    patience_increase = 2  
    improvement_threshold = 0.995  
    validation_frequency = min(n_train_batches, patience / 2)

    best_validation_loss = np.inf
    best_iter = 0
    test_score = 0.
    start_time = time.clock()

    epoch = 0
    done_looping = False

    while (epoch < n_epochs) and (not done_looping):
        epoch = epoch + 1
        for minibatch_index in xrange(n_train_batches):
            train_model(minibatch_index)
            
            iter = (epoch - 1) * n_train_batches + minibatch_index

            if (iter + 1) % validation_frequency == 0:
                
                validation_losses = [validate_model(i) for i in xrange(n_valid_batches)]
                this_validation_loss = np.mean(validation_losses)

                print('epoch %i, minibatch %i/%i, validation error %f %%' %
                     (epoch, minibatch_index + 1, n_train_batches,
                      this_validation_loss * 100.))

                if this_validation_loss < best_validation_loss:
                    
                    if this_validation_loss < best_validation_loss * improvement_threshold:
                        patience = max(patience, iter * patience_increase)

                    best_validation_loss = this_validation_loss
                    best_iter = iter

                    test_losses = [test_model(i) for i in xrange(n_test_batches)]
                    test_score = np.mean(test_losses)

                    print(('     epoch %i, minibatch %i/%i, test error of '
                           'best model %f %%') %
                          (epoch, minibatch_index + 1, n_train_batches,
                           test_score * 100.))

            if patience <= iter:
                    done_looping = True
                    break

    end_time = time.clock()
    print(('Optimization complete. Best validation score of %f %% '
           'obtained at iteration %i, with test performance %f %%') %
          (best_validation_loss * 100., best_iter + 1, test_score * 100.))
    print >> sys.stderr, ('The code for file ' +
                          os.path.split(__file__)[1] +
                          ' ran for %.2fm' % ((end_time - start_time) / 60.))
コード例 #6
0
# -*- coding: utf-8 -*-

import numpy as np
import scipy.io as io
import time
import os 
import sys
import theano
import theano.tensor as T
from loadDataset import load_multi



datasets = load_multi()
valid_set_x, valid_set_y = datasets[1]
test_set_x, test_set_y = datasets[2]

x_test, y_test = test_set_x.eval(), test_set_y.eval()
x_valid, y_valid = valid_set_x.eval(), valid_set_y.eval()

x_image = io.loadmat('multi_data/hc_serial.mat')
x_image = x_image['hc_serial']

weights = io.loadmat('multi_data/TrainedWeights.mat')
W1, W2, W3, W4 = weights['W1'], weights['W2'], weights['W3'], weights['W4']
b1, b2, b3, b4 = weights['b1'], weights['b2'], weights['b3'], weights['b4']

del datasets, valid_set_x, valid_set_y, test_set_x, test_set_y, weights

x = x_image/8000.