Python backend.ones_like方法代码示例

# 需要导入模块: from keras import backend [as 别名]
# 或者: from keras.backend import ones_like [as 别名]
def get_constants(self, x):
    constants = []
    if 0 < self.dropout_U < 1:
      ones = K.ones_like(K.reshape(x[:, 0, 0], (-1, 1)))
      ones = K.tile(ones, (1, self.output_dim))
      B_U = [K.in_train_phase(K.dropout(ones, self.dropout_U), ones) for _ in range(3)]
      constants.append(B_U)
    else:
      constants.append([K.cast_to_floatx(1.) for _ in range(3)])

    if 0 < self.dropout_W < 1:
      input_shape = self.input_spec[0].shape
      input_dim = input_shape[-1]
      ones = K.ones_like(K.reshape(x[:, 0, 0], (-1, 1)))
      ones = K.tile(ones, (1, input_dim))
      B_W = [K.in_train_phase(K.dropout(ones, self.dropout_W), ones) for _ in range(3)]
      constants.append(B_W)
    else:
      constants.append([K.cast_to_floatx(1.) for _ in range(3)])
    return constants 

# 需要导入模块: from keras import backend [as 别名]
# 或者: from keras.backend import ones_like [as 别名]
def get_constants(self, x):
		constants = []
		if 0 < self.dropout_U < 1:
			ones = K.ones_like(K.reshape(x[:, 0, 0], (-1, 1)))
			ones = K.tile(ones, (1, self.hidden_recurrent_dim))
			B_U = K.in_train_phase(K.dropout(ones, self.dropout_U), ones)
			constants.append(B_U)
		else:
			constants.append(K.cast_to_floatx(1.))
        
		if self.consume_less == 'cpu' and 0 < self.dropout_W < 1:
			input_shape = self.input_spec[0].shape
			input_dim = input_shape[-1]
			ones = K.ones_like(K.reshape(x[:, 0, 0], (-1, 1)))
			ones = K.tile(ones, (1, input_dim))
			B_W = K.in_train_phase(K.dropout(ones, self.dropout_W), ones)
			constants.append(B_W)
		else:
			constants.append(K.cast_to_floatx(1.))

		return constants 

# 需要导入模块: from keras import backend [as 别名]
# 或者: from keras.backend import ones_like [as 别名]
def get_constants(self, x):
		constants = []
		if 0 < self.dropout_U < 1:
			ones = K.ones_like(K.reshape(x[:, 0, 0], (-1, 1)))
			ones = K.tile(ones, (1, self.input_dim))
			B_U = [K.in_train_phase(K.dropout(ones, self.dropout_U), ones) for _ in range(4)]
			constants.append(B_U)
		else:
			constants.append([K.cast_to_floatx(1.) for _ in range(4)])

		if 0 < self.dropout_W < 1:
			input_shape = K.int_shape(x)
			input_dim = input_shape[-1]
			ones = K.ones_like(K.reshape(x[:, 0, 0], (-1, 1)))
			ones = K.tile(ones, (1, int(input_dim)))
			B_W = [K.in_train_phase(K.dropout(ones, self.dropout_W), ones) for _ in range(4)]
			constants.append(B_W)
		else:
			constants.append([K.cast_to_floatx(1.) for _ in range(4)])
		return constants 

# 需要导入模块: from keras import backend [as 别名]
# 或者: from keras.backend import ones_like [as 别名]
def get_constants(self, x):
        constants = []
        if 0 < self.dropout_U < 1:
            ones = K.ones_like(K.reshape(x[:, 0, 0], (-1, 1)))
            ones = K.tile(ones, (1, self.output_dim))
            B_U = [K.in_train_phase(K.dropout(ones, self.dropout_U), ones) for _ in range(4)]
            constants.append(B_U)
        else:
            constants.append([K.cast_to_floatx(1.) for _ in range(4)])

        if 0 < self.dropout_W < 1:
            input_shape = self.input_spec[0].shape
            input_dim = input_shape[-1]
            ones = K.ones_like(K.reshape(x[:, 0, 0], (-1, 1)))
            ones = K.tile(ones, (1, int(input_dim)))
            B_W = [K.in_train_phase(K.dropout(ones, self.dropout_W), ones) for _ in range(4)]
            constants.append(B_W)
        else:
            constants.append([K.cast_to_floatx(1.) for _ in range(4)])
        return constants 

# 需要导入模块: from keras import backend [as 别名]
# 或者: from keras.backend import ones_like [as 别名]
def get_constants(self, x):
      constants = []
      if 0 < self.dropout_U < 1:
          ones = K.ones_like(K.reshape(x[:, 0, 0], (-1, 1)))
          ones = K.concatenate([ones] * self.output_dim, 1)
          B_U = K.in_train_phase(K.dropout(ones, self.dropout_U), ones)
          constants.append(B_U)
      else:
          constants.append(K.cast_to_floatx(1.))
      if self.consume_less == 'cpu' and 0 < self.dropout_W < 1:
          input_shape = self.input_spec[0].shape
          input_dim = input_shape[-1]
          ones = K.ones_like(K.reshape(x[:, 0, 0], (-1, 1)))
          ones = K.concatenate([ones] * input_dim, 1)
          B_W = K.in_train_phase(K.dropout(ones, self.dropout_W), ones)
          constants.append(B_W)
      else:
          constants.append(K.cast_to_floatx(1.))
      return constants 

# 需要导入模块: from keras import backend [as 别名]
# 或者: from keras.backend import ones_like [as 别名]
def weighted_dice_loss(y_true, y_pred):
    y_true = K.cast(y_true, 'float32')
    y_pred = K.cast(y_pred, 'float32')
    # if we want to get same size of output, kernel size must be odd number
    if K.int_shape(y_pred)[1] == 128:
        kernel_size = 11
    elif K.int_shape(y_pred)[1] == 256:
        kernel_size = 21
    elif K.int_shape(y_pred)[1] == 512:
        kernel_size = 21
    elif K.int_shape(y_pred)[1] == 1024:
        kernel_size = 41
    else:
        raise ValueError('Unexpected image size')
    averaged_mask = K.pool2d(
        y_true, pool_size=(kernel_size, kernel_size), strides=(1, 1), padding='same', pool_mode='avg')
    border = K.cast(K.greater(averaged_mask, 0.005), 'float32') * K.cast(K.less(averaged_mask, 0.995), 'float32')
    weight = K.ones_like(averaged_mask)
    w0 = K.sum(weight)
    weight += border * 2
    w1 = K.sum(weight)
    weight *= (w0 / w1)
    loss = 1 - weighted_dice_coeff(y_true, y_pred, weight)
    return loss 

# 需要导入模块: from keras import backend [as 别名]
# 或者: from keras.backend import ones_like [as 别名]
def weighted_bce_dice_loss(y_true, y_pred):
    y_true = K.cast(y_true, 'float32')
    y_pred = K.cast(y_pred, 'float32')
    # if we want to get same size of output, kernel size must be odd number
    if K.int_shape(y_pred)[1] == 128:
        kernel_size = 11
    elif K.int_shape(y_pred)[1] == 256:
        kernel_size = 21
    elif K.int_shape(y_pred)[1] == 512:
        kernel_size = 21
    elif K.int_shape(y_pred)[1] == 1024:
        kernel_size = 41
    else:
        raise ValueError('Unexpected image size')
    averaged_mask = K.pool2d(
        y_true, pool_size=(kernel_size, kernel_size), strides=(1, 1), padding='same', pool_mode='avg')
    border = K.cast(K.greater(averaged_mask, 0.005), 'float32') * K.cast(K.less(averaged_mask, 0.995), 'float32')
    weight = K.ones_like(averaged_mask)
    w0 = K.sum(weight)
    weight += border * 2
    w1 = K.sum(weight)
    weight *= (w0 / w1)
    loss = weighted_bce_loss(y_true, y_pred, weight) + (1 - weighted_dice_coeff(y_true, y_pred, weight))
    return loss 

# 需要导入模块: from keras import backend [as 别名]
# 或者: from keras.backend import ones_like [as 别名]
def get_constants(self, x):
        constants = []
        if 0 < self.dropout_U < 1:
            ones = K.ones_like(K.reshape(x[:, 0, 0], (-1, 1)))
            ones = K.tile(ones, (1, self.output_dim))
            B_U = [K.in_train_phase(K.dropout(ones, self.dropout_U), ones) for _ in range(3)]
            constants.append(B_U)
        else:
            constants.append([K.cast_to_floatx(1.) for _ in range(3)])

        if 0 < self.dropout_W < 1:
            input_shape = K.int_shape(x)
            input_dim = input_shape[-1]
            ones = K.ones_like(K.reshape(x[:, 0, 0], (-1, 1)))
            ones = K.tile(ones, (1, int(input_dim)))
            B_W = [K.in_train_phase(K.dropout(ones, self.dropout_W), ones) for _ in range(3)]
            constants.append(B_W)
        else:
            constants.append([K.cast_to_floatx(1.) for _ in range(3)])
        return constants 

# 需要导入模块: from keras import backend [as 别名]
# 或者: from keras.backend import ones_like [as 别名]
def get_constants(self, inputs, training=None):
        constants = []
        '''if 0 < self.dropout_U < 1:
            ones = K.ones_like(K.reshape(x[:, 0, 0], (-1, 1)))
            ones = K.tile(ones, (1, self.units))
            B_U = [K.in_train_phase(K.dropout(ones, self.dropout_U), ones) for _ in range(3)]
            constants.append(B_U)
        else:
            constants.append([K.cast_to_floatx(1.) for _ in range(3)])

        if 0 < self.dropout_W < 1:
            input_shape = K.int_shape(x)
            input_dim = input_shape[-1]
            ones = K.ones_like(K.reshape(x[:, 0, 0], (-1, 1)))
            ones = K.tile(ones, (1, int(input_dim)))
            B_W = [K.in_train_phase(K.dropout(ones, self.dropout_W), ones) for _ in range(3)]
            constants.append(B_W)
        else:'''
        constants.append([K.cast_to_floatx(1.) for _ in range(3)])
        return constants 

# 需要导入模块: from keras import backend [as 别名]
# 或者: from keras.backend import ones_like [as 别名]
def call(self, x, mask=None):
        mean = super(IntraAttention, self).call(x, mask)
        # x: (batch_size, input_length, input_dim)
        # mean: (batch_size, input_dim)
        ones = K.expand_dims(K.mean(K.ones_like(x), axis=(0, 2)), dim=0)  # (1, input_length)
        # (batch_size, input_length, input_dim)
        tiled_mean = K.permute_dimensions(K.dot(K.expand_dims(mean), ones), (0, 2, 1))
        if mask is not None:
            if K.ndim(mask) > K.ndim(x):
                # Assuming this is because of the bug in Bidirectional. Temporary fix follows.
                # TODO: Fix Bidirectional.
                mask = K.any(mask, axis=(-2, -1))
            if K.ndim(mask) < K.ndim(x):
                mask = K.expand_dims(mask)
            x = switch(mask, x, K.zeros_like(x))
        # (batch_size, input_length, proj_dim)
        projected_combination = K.tanh(K.dot(x, self.vector_projector) + K.dot(tiled_mean, self.mean_projector))
        scores = K.dot(projected_combination, self.scorer)  # (batch_size, input_length)
        weights = K.softmax(scores)  # (batch_size, input_length)
        attended_x = K.sum(K.expand_dims(weights) * x, axis=1)  # (batch_size, input_dim)
        return attended_x 

# 需要导入模块: from keras import backend [as 别名]
# 或者: from keras.backend import ones_like [as 别名]
def _ternarize(W, H=1):
    '''The weights' ternarization function, 

    # References:
    - [Recurrent Neural Networks with Limited Numerical Precision](http://arxiv.org/abs/1608.06902)
    - [Ternary Weight Networks](http://arxiv.org/abs/1605.04711)
    '''
    W /= H

    ones = K.ones_like(W)
    zeros = K.zeros_like(W)
    Wt = switch(W > 0.5, ones, switch(W <= -0.5, -ones, zeros))

    Wt *= H

    return Wt 

# 需要导入模块: from keras import backend [as 别名]
# 或者: from keras.backend import ones_like [as 别名]
def call(self, inputs, mask=None):
        assert(isinstance(inputs, list) and len(inputs) == 5)
        uQ, WQ_u, WQ_v, v, VQ_r = inputs
        uQ_mask = mask[0] if mask is not None else None

        ones = K.ones_like(K.sum(uQ, axis=1, keepdims=True)) # (B, 1, 2H)
        s_hat = K.dot(uQ, WQ_u)
        s_hat += K.dot(ones, K.dot(WQ_v, VQ_r))
        s_hat = K.tanh(s_hat)
        s = K.dot(s_hat, v)
        s = K.batch_flatten(s)

        a = softmax(s, mask=uQ_mask, axis=1)

        rQ = K.batch_dot(uQ, a, axes=[1, 1])

        return rQ 

# 需要导入模块: from keras import backend [as 别名]
# 或者: from keras.backend import ones_like [as 别名]
def contingency_table(y, z):
    """Compute contingency table."""
    y = K.round(y)
    z = K.round(z)

    def count_matches(a, b):
        tmp = K.concatenate([a, b])
        return K.sum(K.cast(K.all(tmp, -1), K.floatx()))

    ones = K.ones_like(y)
    zeros = K.zeros_like(y)
    y_ones = K.equal(y, ones)
    y_zeros = K.equal(y, zeros)
    z_ones = K.equal(z, ones)
    z_zeros = K.equal(z, zeros)

    tp = count_matches(y_ones, z_ones)
    tn = count_matches(y_zeros, z_zeros)
    fp = count_matches(y_zeros, z_ones)
    fn = count_matches(y_ones, z_zeros)

    return (tp, tn, fp, fn) 

# 需要导入模块: from keras import backend [as 别名]
# 或者: from keras.backend import ones_like [as 别名]
def get_constants(self, x):
        constants = []
        if 0 < self.dropout_U < 1:
            ones = K.ones_like(K.reshape(x[:, 0, 0], (-1, 1)))
            ones = K.concatenate([ones] * self.output_dim, 1)
            B_U = [K.in_train_phase(K.dropout(ones, self.dropout_U), ones) for _ in range(4)]
            constants.append(B_U)
        else:
            constants.append([K.cast_to_floatx(1.) for _ in range(4)])

        if 0 < self.dropout_W < 1:
            input_shape = self.input_spec[0].shape
            input_dim = input_shape[-1]
            ones = K.ones_like(K.reshape(x[:, 0, 0], (-1, 1)))
            ones = K.concatenate([ones] * input_dim, 1)
            B_W = [K.in_train_phase(K.dropout(ones, self.dropout_W), ones) for _ in range(4)]
            constants.append(B_W)
        else:
            constants.append([K.cast_to_floatx(1.) for _ in range(4)])
        return constants 

# 需要导入模块: from keras import backend [as 别名]
# 或者: from keras.backend import ones_like [as 别名]
def call(self, inputs, mask=None):
        """
        Extract the GRU output for the target document index for the forward
        and backwards GRU outputs, and then concatenate them. If the target word index
        is at index l, and there are T total document words, the desired output
        in the forward pass is at GRU_f[l] (ignoring the batched case) and the
        desired output of the backwards pass is at GRU_b[T-l].

        We need to get these two vectors and concatenate them. To do so, we'll
        reverse the backwards GRU, which allows us to use the same index/mask for both.
        """
        # TODO(nelson): deal with case where cloze token appears multiple times
        # in a question.
        word_indices, gru_f, gru_b = inputs
        index_mask = K.cast(K.equal((K.ones_like(word_indices) * self.target_index),
                                    word_indices), "float32")
        gru_mask = K.repeat_elements(K.expand_dims(index_mask, -1), K.int_shape(gru_f)[-1], K.ndim(gru_f) - 1)
        masked_gru_f = switch(gru_mask, gru_f, K.zeros_like(gru_f))
        selected_gru_f = K.sum(masked_gru_f, axis=1)
        masked_gru_b = switch(gru_mask, gru_b, K.zeros_like(gru_b))
        selected_gru_b = K.sum(masked_gru_b, axis=1)
        selected_bigru = K.concatenate([selected_gru_f, selected_gru_b], axis=-1)
        return selected_bigru