tensorflow--conv函數

#第一種yolo3中程序

def convolutional(input_data, filters_shape, trainable, name, downsample=False, activate=True, bn=True):
   #卷積層名稱
    with tf.variable_scope(name):
        #如果需要下采樣
        if downsample:
            pad_h, pad_w = (filters_shape[0] - 2) // 2 + 1, (filters_shape[1] - 2) // 2 + 1
            paddings = tf.constant([[0, 0], [pad_h, pad_h], [pad_w, pad_w], [0, 0]])
            input_data = tf.pad(input_data, paddings, 'CONSTANT')
            strides = (1, 2, 2, 1)
            padding = 'VALID'
        else:
            strides = (1, 1, 1, 1)
            padding = "SAME"
        #定義一個變量
        weight = tf.get_variable(name='weight', dtype=tf.float32, trainable=True,
                                 shape=filters_shape, initializer=tf.random_normal_initializer(stddev=0.01))
        conv = tf.nn.conv2d(input=input_data, filter=weight, strides=strides, padding=padding)
        #如果歸一化
        if bn:
            conv = tf.layers.batch_normalization(conv, beta_initializer=tf.zeros_initializer(),
                                                 gamma_initializer=tf.ones_initializer(),
                                                 moving_mean_initializer=tf.zeros_initializer(),
                                                 moving_variance_initializer=tf.ones_initializer(), training=trainable)

            #如果不歸一化
        else:
            bias = tf.get_variable(name='bias', shape=filters_shape[-1], trainable=True,
                                   dtype=tf.float32, initializer=tf.constant_initializer(0.0))
            conv = tf.nn.bias_add(conv, bias)

        if activate == True: conv = tf.nn.leaky_relu(conv, alpha=0.1)

    return conv

input_data = common.convolutional(input_data, filters_shape=(3, 3,  3,  32), trainable=trainable, name='conv0')


#第二種yolo1

def _conv_layer(self, x, num_filters, filter_size, stride,scope):

    in_channels = x.get_shape().as_list()[-1]
    weight = tf.Variable(tf.truncated_normal([filter_size, filter_size,
                                              in_channels, num_filters], stddev=0.1),name='weights')
    bias = tf.Variable(tf.zeros([num_filters,]),name='biases')

    pad_size = filter_size // 2
    pad_mat = np.array([[0, 0], [pad_size, pad_size], [pad_size, pad_size], [0, 0]])
    x_pad = tf.pad(x, pad_mat)
    conv = tf.nn.conv2d(x_pad, weight, strides=[1, stride, stride, 1], padding="VALID",name=scope)
    output = self.leak_relu(tf.nn.bias_add(conv, bias))

    return output

net = self._conv_layer(net,  512, 1, 1,'conv_22')