import tensorflow as tf

            self.input_tensor = load_base64_tensor(self.input)
        else:
            raise ValueError("invalid input type '{}'".format(input_type))

        x = self.input_tensor

        x = tf.pad(x, [[0, 0], [3, 3], [3, 3], [0, 0]], 'CONSTANT')

        x = self.__conv2d("conv_1", x, filter_depth=64,
                          kernel_size=7, stride=2, padding='valid')

        x = self.__batch_norm("bn_1", x)
