import tensorflow as tf

      x = tf.nn.dropout(x, rate=dropout)
      x = tf.layers.conv2d(
          x, 64, (4, 4), strides=(2, 2), name="conv2",
          activation=common_layers.belu, padding="SAME")
      x = tf.nn.dropout(x, rate=dropout)
      x = tf.layers.conv2d(
          x, 128, (4, 4), strides=(2, 2), name="conv3",
          activation=common_layers.belu, padding="SAME")
