Python downsample.max_pool_2d函数代码示例

def bench_ConvMed(batchsize):
    data_x.value = randn(n_examples, 1, 96, 96)
    w0 = shared(rand(6, 1, 7, 7) * numpy.sqrt(6 / (25.)))
    b0 = shared(zeros(6))
    w1 = shared(rand(16, 6, 7, 7) * numpy.sqrt(6 / (25.)))
    b1 = shared(zeros(16))
    vv = shared(rand(16*8*8, 120) * numpy.sqrt(6.0/16./25))
    cc = shared(zeros(120))
    v = shared(zeros(120, outputs))
    c = shared(zeros(outputs))
    params = [w0, b0, w1, b1, v, c, vv, cc]

    c0 = tanh(conv2d(sx, w0, image_shape=(batchsize, 1, 96, 96), filter_shape=(6,1,7,7)) + b0.dimshuffle(0, 'x', 'x'))
    s0 = tanh(max_pool_2d(c0, (3,3))) # this is not the correct leNet5 model, but it's closer to

    c1 = tanh(conv2d(s0, w1, image_shape=(batchsize, 6, 30, 30), filter_shape=(16,6,7,7)) + b1.dimshuffle(0, 'x', 'x'))
    s1 = tanh(max_pool_2d(c1, (3,3)))

    p_y_given_x = softmax(dot(tanh(dot(s1.flatten(2), vv)+cc), v)+c)
    nll = -log(p_y_given_x)[arange(sy.shape[0]), sy]
    cost = nll.mean()

    gparams = grad(cost, params)

    train = function([si, nsi], cost,
            updates=[(p,p-lr*gp) for p,gp in zip(params, gparams)])
    eval_and_report(train, "ConvMed", [batchsize], N=120)

    def get_output(self, train):
        X = self.get_input(train)


        if theano.config.device == 'gpu':
            # max_pool_2d X and Z
            output = downsample.max_pool_2d(input=X.dimshuffle(0, 4, 2, 3, 1),
                                            ds=(self.pool_size[1], self.pool_size[2]),
                                            ignore_border=self.ignore_border)

            # max_pool_2d X and Y (with X constant)
            output = downsample.max_pool_2d(input=output.dimshuffle(0, 4, 2, 3, 1),
                                            ds=(1, self.pool_size[0]),
                                            ignore_border=self.ignore_border)
        else: #cpu  order:(batch, row, column, time, inchannel) from cpu convolution
             # max_pool_2d X and Z
            output = downsample.max_pool_2d(input=X.dimshuffle(0, 4, 1, 2, 3),
                                            ds=(self.pool_size[1], self.pool_size[2]),
                                            ignore_border=self.ignore_border)

            # max_pool_2d X and Y (with X constant)
            output = downsample.max_pool_2d(input=output.dimshuffle(0, 1, 4, 3, 2),
                                            ds=(1, self.pool_size[0]),
                                            ignore_border=self.ignore_border)
            output = output.dimshuffle(0, 4, 3, 2, 1)

        return output

    def output(self, input, mask=None):
        if mask is None:
            drop_in = input * self.drop
        else:
            drop_in = input * mask

        conv_out1 = conv.conv2d(input=drop_in, filters=self.W1, filter_shape=self.filter_shape1,
                               image_shape=self.shape_in)
        linout1 = T.nnet.relu(conv_out1 + self.b1.dimshuffle('x', 0, 'x', 'x'))
        output1 = (
            linout1 if self.activation is None
            else self.activation(linout1)
        )
        pooled_out1 = downsample.max_pool_2d(input=output1, ds=self.poolsize1, ignore_border=True)

        conv_out2 = conv.conv2d(input=drop_in, filters=self.W2, filter_shape=self.filter_shape2,
                                image_shape=self.shape_in)
        linout2 = T.nnet.relu(conv_out2 + self.b2.dimshuffle('x', 0, 'x', 'x'))
        output2 = (
            linout2 if self.activation is None
            else self.activation(linout2)
        )
        pooled_out2 = downsample.max_pool_2d(input=output2, ds=self.poolsize2, ignore_border=True)

        conv_out3 = conv.conv2d(input=drop_in, filters=self.W3, filter_shape=self.filter_shape3,
                                image_shape=self.shape_in)
        linout3 = T.nnet.relu(conv_out3 + self.b3.dimshuffle('x', 0, 'x', 'x'))
        output3 = (
            linout3 if self.activation is None
            else self.activation(linout3)
        )
        pooled_out3 = downsample.max_pool_2d(input=output3, ds=self.poolsize3, ignore_border=True)

        output = T.concatenate([pooled_out1, pooled_out2, pooled_out3], axis=1)
        return output

def bench_ConvLarge(batchsize, variant=True):
    name = "ConvLarge_b" + str(GlobalBenchReporter.batch_size)
    name += "_" + config.linker

    # Image shape 256x256
    GlobalBenchReporter.batch_size = batchsize
    data_x.set_value(randn(n_examples, 1, 256, 256))
    w0 = shared(rand(6, 1, 7, 7) * numpy.sqrt(6 / (25.)))
    b0 = shared(zeros(6))
    w1 = shared(rand(16, 6, 7, 7) * numpy.sqrt(6 / (25.)))
    b1 = shared(zeros(16))
    vv = shared(rand(16 * 11 * 11, 120) * numpy.sqrt(6.0 / 16. / 25))
    cc = shared(zeros(120))
    v = shared(zeros(120, outputs))
    c = shared(zeros(outputs))
    params = [w0, b0, w1, b1, v, c, vv, cc]

    c0 = tanh(conv2d(sx, w0, image_shape=(batchsize, 1, 256, 256),
                     filter_shape=(6, 1, 7, 7)) + b0.dimshuffle(0, 'x', 'x'))
    # this is not the correct leNet5 model, but it's closer to
    s0 = tanh(max_pool_2d(c0, (5, 5)))

    c1 = tanh(conv2d(s0, w1, image_shape=(batchsize, 6, 50, 50),
                     filter_shape=(16, 6, 7, 7)) + b1.dimshuffle(0, 'x', 'x'))
    s1 = tanh(max_pool_2d(c1, (4, 4)))

    p_y_given_x = softmax(dot(tanh(dot(s1.flatten(2), vv) + cc), v) + c)
    nll = -log(p_y_given_x)[arange(sy.shape[0]), sy]
    cost = nll.mean()

    gparams = grad(cost, params)

    train = function([si, nsi], cost,
                     updates=[(p, p - lr * gp) for p, gp in zip(params, gparams)],
                     name=name)
    GlobalBenchReporter.eval_model(train, name)
    if not variant:
        return

    # Versions with no inputs
    snsi.set_value(GlobalBenchReporter.batch_size)
    c0 = tanh(conv2d(ssx, w0, image_shape=(batchsize, 1, 256, 256),
                     filter_shape=(6, 1, 7, 7)) + b0.dimshuffle(0, 'x', 'x'))
    # this is not the correct leNet5 model, but it's closer to
    s0 = tanh(max_pool_2d(c0, (5, 5)))

    c1 = tanh(conv2d(s0, w1, image_shape=(batchsize, 6, 50, 50),
                     filter_shape=(16, 6, 7, 7)) + b1.dimshuffle(0, 'x', 'x'))
    s1 = tanh(max_pool_2d(c1, (4, 4)))

    p_y_given_x = softmax(dot(tanh(dot(s1.flatten(2), vv) + cc), v) + c)
    nll = -log(p_y_given_x)[arange(ssy.shape[0]), ssy]
    cost = nll.mean()

    gparams = grad(cost, params)

    train2 = function([], cost,
                      updates=[(p, p - lr * gp) for p, gp in zip(params, gparams)] + [(ssi, ssi + snsi)],
                      name=name)
    GlobalBenchReporter.bypass_eval_model(train2, name, init_to_zero=ssi)

    def __init__(self, rng, input_A, input_B, filter_shape, image_shape, poolsize=(2, 2)):

        print image_shape
        print filter_shape
        assert image_shape[1] == filter_shape[1]

        #calc the W_bound and init the W
        fan_in = numpy.prod(filter_shape[1:])
        fan_out = (filter_shape[0] * numpy.prod(filter_shape[2:]) /
                   numpy.prod(poolsize))
        W_bound = numpy.sqrt(6. / (fan_in + fan_out))
        self.W = theano.shared(numpy.asarray(
            rng.uniform(low=-W_bound, high=W_bound, size=filter_shape),
            dtype = theano.config.floatX),
                        borrow = True)

        b_value = numpy.zeros((filter_shape[0],), 
                              dtype = theano.config.floatX)
        self.b = theano.shared(value = b_value, borrow = True)


        conv_out_A = conv.conv2d(input = input_A, filters = self.W, 
                filter_shape = filter_shape, image_shape = image_shape)
        conv_out_B = conv.conv2d(input = input_B, filters = self.W, 
                filter_shape = filter_shape, image_shape = image_shape)
        pooled_out_A = downsample.max_pool_2d(input = conv_out_A,
                                ds = poolsize, ignore_border = True)
        pooled_out_B = downsample.max_pool_2d(input = conv_out_B,
                                ds = poolsize, ignore_border = True)


        self.output_A = T.tanh(pooled_out_A + self.b.dimshuffle('x',0,'x','x'))
        self.output_B = T.tanh(pooled_out_B + self.b.dimshuffle('x',0,'x','x'))

        self.params = [self.W, self.b]

def convolutional_model(X, w_1, w_2, w_3, w_4, w_5, w_6, p_1, p_2, p_3, p_4, p_5):
    l1 = dropout(T.tanh( max_pool_2d(T.maximum(conv2d(X, w_1, border_mode='full'),0.), (2, 2),ignore_border=True) + b_1.dimshuffle('x', 0, 'x', 'x') ), p_1)
    l2 = dropout(T.tanh( max_pool_2d(T.maximum(conv2d(l1, w_2), 0.), (2, 2),ignore_border=True) + b_2.dimshuffle('x', 0, 'x', 'x') ), p_2)
    l3 = dropout(T.flatten(T.tanh( max_pool_2d(T.maximum(conv2d(l2, w_3), 0.), (2, 2),ignore_border=True) + b_3.dimshuffle('x', 0, 'x', 'x') ), outdim=2), p_3)# flatten to switch back to 1d layers
    l4 = dropout(T.maximum(T.dot(l3, w_4), 0.), p_4)
    l5 = dropout(T.maximum(T.dot(l4, w_5), 0.), p_5)
    return T.dot(l5, w_6)

def model(X, w, w2, w3, w4, w5, w_o, b_h1, b_h2, b_o, p_drop_conv, p_drop_hidden):
  
    l1_lin  = conv2d(X, w, border_mode='full')+b_c1.dimshuffle('x', 0, 'x', 'x')
    l1a     = alpha_c1 * rectify(l1_lin) + (1.- alpha_c1) * T.tanh(l1_lin)
    l1      = max_pool_2d(l1a, (2, 2))
    l1      = dropout(l1, p_drop_conv)

    l2_lin = conv2d(l1, w2) + b_c2.dimshuffle('x', 0, 'x', 'x')
    l2a    = alpha_c2 * rectify(l2_lin) + (1. - alpha_c2) * T.tanh(l2_lin)
    l2     = max_pool_2d(l2a, (2, 2))
    l2     = dropout(l2, p_drop_conv)

    l3_lin = conv2d(l2, w3) + b_c3.dimshuffle('x', 0, 'x', 'x')
    l3a    = alpha_c3 * rectify(l3_lin) + ( 1 - alpha_c3) * T.tanh(l3_lin)
    l3b    = max_pool_2d(l3a, (2, 2))
    l3     = T.flatten(l3b, outdim=2)
    l3     = dropout(l3, p_drop_conv)

    l4_lin = T.dot(l3, w4) + b_h1 
    l4 = alpha_h1 * rectify(l4_lin) + (1.-alpha_h1) * T.tanh(l4_lin)
    l4 = dropout(l4, p_drop_hidden)

    l5_lin = T.dot(l4, w5) + b_h2
    l5 = alpha_h1 * rectify(l5_lin) + (1.-alpha_h2) * T.tanh(l5_lin)
    l5 = dropout(l5, p_drop_hidden)

    pyx = softmax(T.dot(l5, w_o) + b_o )
    return l1, l2, l3, l4, l5, pyx

def test_pooling_opt():
    if not dnn.dnn_available():
        raise SkipTest(dnn.dnn_available.msg)

    x = T.fmatrix()

    f = theano.function(
        [x],
        max_pool_2d(x, ds=(2, 2), mode='average_inc_pad',
                    ignore_border=True),
        mode=mode_with_gpu)

    assert any([isinstance(n.op, dnn.GpuDnnPool)
                for n in f.maker.fgraph.toposort()])

    f(numpy.zeros((10, 10), dtype='float32'))

    f = theano.function(
        [x],
        T.grad(max_pool_2d(x, ds=(2, 2), mode='average_inc_pad',
                           ignore_border=True).sum(),
               x),
        mode=mode_with_gpu.including("cudnn"))

    assert any([isinstance(n.op, dnn.GpuDnnPoolGrad)
                for n in f.maker.fgraph.toposort()])

    f(numpy.zeros((10, 10), dtype='float32'))

	def model(self, X, w1, w2, w3, w4, wo, p_drop_conv, p_drop_hidden):
		nin1 = self.init_weights((32, 3, 1, 1))
		nin2 = self.init_weights((64, 3, 1, 1))
		nin3 = self.init_weights((128, 3, 1, 1))

		l1a = self.rectify(conv2d(X, w1, border_mode = "full"))
		l1 = max_pool_2d(l1a, (2, 2))
		l1 = conv2d(l1, nin1)
		l1 = self.dropout(l1, p_drop_conv)

		l2a = self.rectify(conv2d(l1, w2))
		l2 = max_pool_2d(l2a, (2, 2))
		l2 = conv2d(l2, nin2)
		l2 = self.dropout(l2, p_drop_conv)

		l3a = self.rectify(conv2d(l2, w3))
		l3b = max_pool_2d(l3a, (2, 2))
		l3b = conv2d(l3b, nin3)
		l3 = T.flatten(l3b, outdim = 2)
		l3 = self.dropout(l3, p_drop_conv)

		l4 = self.rectify(T.dot(l3, w4))
		l4 = self.dropout(l4, p_drop_hidden)

		pyx = self.softmax(T.dot(l4, wo))
		return l1, l2, l3, l4, pyx

	def model(self, X, w1, w2, w3, w4, wo, p_drop_conv, p_drop_hidden):
		
		# print X
		l1a = self.rectify(conv2d(X, w1, border_mode = "full"))
		l1 = max_pool_2d(l1a, (2, 2))
		l1 = self.dropout(l1, p_drop_conv)
		# print np.mean(l1)
		
		l2a = self.rectify(conv2d(l1, w2))
		l2 = max_pool_2d(l2a, (2, 2))
		l2 = self.dropout(l2, p_drop_conv)
		# print np.mean(l2)

		l3a = self.rectify(conv2d(l2, w3))
		l3b = max_pool_2d(l3a, (2, 2))
		l3 = T.flatten(l3b, outdim = 2)
		l3 = self.dropout(l3, p_drop_conv)
		# print np.mean(l3)
		
		l4 = self.rectify(T.dot(l3, w4))
		l4 = self.dropout(l4, p_drop_hidden)
		# print np.mean(l4)
		# l4 = T.dot(l4, wo)
		sig = T.dot(l4, wo)
		# pyx = self.softmax(T.dot(l4, wo))
		return l1, l2, l3, l4, sig

    def __init__(self, rng, input, filter_shape, image_shape, 
                poolsize=(2, 2), poolmode="max", non_linear="tanh"):
        """
        Allocate a LeNetConvPoolLayer with shared variable internal parameters.

        :type rng: numpy.random.RandomState
        :param rng: a random number generator used to initialize weights

        :type input: theano.tensor.dtensor4
        :param input: symbolic image tensor, of shape image_shape

        :type filter_shape: tuple or list of length 4
        :param filter_shape: (number of filters, num input feature maps,
                              filter height,filter width)

        :type image_shape: tuple or list of length 4
        :param image_shape: (batch size, num input feature maps,
                             image height, image width)

        :type poolsize: tuple or list of length 2
        :param poolsize: the downsampling (pooling) factor (#rows,#cols)
        """

        assert image_shape[1] == filter_shape[1]
        self.input = input
        self.filter_shape = filter_shape
        self.image_shape = image_shape
        self.poolsize = poolsize
        self.non_linear = non_linear
        self.poolmode = poolmode
        # there are "num input feature maps * filter height * filter width"
        # inputs to each hidden unit
        fan_in = numpy.prod(filter_shape[1:])
        # each unit in the lower layer receives a gradient from:
        # "num output feature maps * filter height * filter width" /
        #   pooling size
        fan_out = (filter_shape[0] * numpy.prod(filter_shape[2:]) /numpy.prod(poolsize))
        # initialize weights with random weights
        if self.non_linear=="none" or self.non_linear=="relu":
            self.W = theano.shared(numpy.asarray(rng.uniform(low=-0.01,high=0.01,size=filter_shape), 
                                                dtype=theano.config.floatX),borrow=True,name="W_conv")
        else:
            W_bound = numpy.sqrt(6. / (fan_in + fan_out))
            self.W = theano.shared(numpy.asarray(rng.uniform(low=-W_bound, high=W_bound, size=filter_shape),
                dtype=theano.config.floatX),borrow=True,name="W_conv")   
        b_values = numpy.zeros((filter_shape[0],), dtype=theano.config.floatX)
        self.b = theano.shared(value=b_values, borrow=True, name="b_conv")
        
        # convolve input feature maps with filters
        conv_out = conv.conv2d(input=input, filters=self.W,filter_shape=self.filter_shape, image_shape=self.image_shape)
        if self.non_linear=="tanh":
            conv_out_tanh = T.tanh(conv_out + self.b.dimshuffle('x', 0, 'x', 'x'))
            self.output = downsample.max_pool_2d(input=conv_out_tanh, ds=self.poolsize, ignore_border=True, mode=self.poolmode)
        elif self.non_linear=="relu":
            conv_out_tanh = ReLU(conv_out + self.b.dimshuffle('x', 0, 'x', 'x'))
            self.output = downsample.max_pool_2d(input=conv_out_tanh, ds=self.poolsize, ignore_border=True, mode=self.poolmode)
        else:
            pooled_out = downsample.max_pool_2d(input=conv_out, ds=self.poolsize, ignore_border=True, mode=self.poolmode)
            self.output = pooled_out + self.b.dimshuffle('x', 0, 'x', 'x')
        self.params = [self.W, self.b]

def model(X, w, w2, w3, w4, w_o, p_drop_conv, p_drop_hidden):

    # conv + ReLU + pool
    # border_mode = full, then zero-padding, default is valid
    l1a = rectify(conv2d(X, w, border_mode='full'))
    # pooling at 2*2 kernel and select the largest in the kernel
    l1 = max_pool_2d(l1a, (2, 2))
    l1 = dropout(l1, p_drop_conv)

    # conv + ReLU + pool
    l2a = rectify(conv2d(l1, w2))
    l2 = max_pool_2d(l2a, (2, 2))
    l2 = dropout(l2, p_drop_conv)

    # conv + ReLU + pool
    l3a = rectify(conv2d(l2, w3))
    l3b = max_pool_2d(l3a, (2, 2))
    # convert a ndim array to 2 dim. if l3b dim larger than 2 then the rest dim collapsed.
    # flatten for enter the FC layer
    l3 = T.flatten(l3b, outdim=2)
    l3 = dropout(l3, p_drop_conv)

    # FC + ReLU
    l4 = rectify(T.dot(l3, w4))
    l4 = dropout(l4, p_drop_hidden)


    # output layer + softmax
    pyx = softmax(T.dot(l4, w_o))

    return l1, l2, l3, l4, pyx

def pool2d(x, pool_size, strides=(1, 1), border_mode='valid',
           dim_ordering='th', pool_mode='max'):
    if border_mode == 'same':
        # TODO: add implementation for border_mode="same"
        raise Exception('border_mode="same" not supported with Theano.')
    elif border_mode == 'valid':
        ignore_border = True
        padding = (0, 0)
    else:
        raise Exception('Invalid border mode: ' + str(border_mode))

    if dim_ordering not in {'th', 'tf'}:
        raise Exception('Unknown dim_ordering ' + str(dim_ordering))

    if dim_ordering == 'tf':
        x = x.dimshuffle((0, 3, 1, 2))

    if pool_mode == 'max':
        pool_out = downsample.max_pool_2d(x, ds=pool_size, st=strides,
                                          ignore_border=ignore_border,
                                          padding=padding,
                                          mode='max')
    elif pool_mode == 'avg':
        pool_out = downsample.max_pool_2d(x, ds=pool_size, st=strides,
                                          ignore_border=ignore_border,
                                          padding=padding,
                                          mode='average_exc_pad')
    else:
        raise Exception('Invalid pooling mode: ' + str(pool_mode))

    if dim_ordering == 'tf':
        pool_out = pool_out.dimshuffle((0, 2, 3, 1))
    return pool_out

def pool2d(x, pool_size, strides=(1, 1), border_mode="valid", dim_ordering="th", pool_mode="max"):
    if border_mode == "same":
        # TODO: add implementation for border_mode="same"
        raise Exception('border_mode="same" not supported with Theano.')
    elif border_mode == "valid":
        ignore_border = True
        padding = (0, 0)
    else:
        raise Exception("Invalid border mode: " + str(border_mode))

    if dim_ordering not in {"th", "tf"}:
        raise Exception("Unknown dim_ordering " + str(dim_ordering))

    if dim_ordering == "tf":
        x = x.dimshuffle((0, 3, 1, 2))

    if pool_mode == "max":
        pool_out = downsample.max_pool_2d(
            x, ds=pool_size, st=strides, ignore_border=ignore_border, padding=padding, mode="max"
        )
    elif pool_mode == "avg":
        pool_out = downsample.max_pool_2d(
            x, ds=pool_size, st=strides, ignore_border=ignore_border, padding=padding, mode="average_exc_pad"
        )
    else:
        raise Exception("Invalid pooling mode: " + str(pool_mode))

    if dim_ordering == "tf":
        pool_out = pool_out.dimshuffle((0, 2, 3, 1))
    return pool_out

def testmodel(X, w, w2, w3, w_o, p_drop_conv, p_drop_hidden):
    l1a = rectify(conv2d(X, w, border_mode='valid'))
    l1 = max_pool_2d(l1a, (2, 2))
    l1 = dropout(l1, p_drop_conv)

    l2a = rectify(conv2d(l1, w2))
    l2b = max_pool_2d(l2a, (2, 2))
    l2 = T.flatten(l2b, outdim=2)
    l2 = dropout(l2, p_drop_conv)

    l3 = rectify(T.dot(l2, w3))
    l3 = dropout(l3, p_drop_hidden)
    
    pyx = softmax(T.dot(l3, w_o))
    # l3a = rectify(conv2d(l2, w3))
    # l3b = max_pool_2d(l3a, (2, 2))
    # l3 = T.flatten(l3b, outdim=2)
    # l3 = dropout(l3, p_drop_conv)

    # problem happening here
    # l4 = rectify(T.dot(l3, w4))
    # l4 = dropout(l4, p_drop_hidden)

    # pyx = softmax(T.dot(l4, w_o))
    return l1, l2, l3, pyx