import tensorflow as tf

        b = tf.get_variable(name='bias',
                            trainable=is_pretrain,
                            shape=[out_channels],
                            initializer=tf.contrib.layers.xavier_initializer())
        x = tf.nn.conv3d(x, w, strides=strides, padding='SAME', data_format=data_format, name='conv3d')
        x = tf.nn.bias_add(x, b, name='bias_add')
