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#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
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"""Tests for the overall MOSAIC segmentation network modeling."""

from absl.testing import parameterized
import numpy as np
import tensorflow as tf

from official.projects.mosaic.modeling import mosaic_blocks
from official.projects.mosaic.modeling import mosaic_head
from official.projects.mosaic.modeling import mosaic_model
from official.vision.modeling import backbones


class SegmentationNetworkTest(parameterized.TestCase, tf.test.TestCase):

  @parameterized.parameters(
      (128, [4, 8], [3, 2], ['concat_merge', 'sum_merge']),
      (128, [1, 4, 8], [3, 2], ['concat_merge', 'sum_merge']),
      (128, [1, 4, 8], [3, 2], ['sum_merge', 'sum_merge']),
      (128, [1, 4, 8], [3, 2], ['concat_merge', 'concat_merge']),
      (512, [1, 4, 8, 16], [3, 2], ['concat_merge', 'sum_merge']),
      (256, [4, 8], [3, 2], ['concat_merge', 'sum_merge']),
      (256, [1, 4, 8], [3, 2], ['concat_merge', 'sum_merge']),
      (256, [1, 4, 8, 16], [3, 2], ['concat_merge', 'sum_merge']),
  )
  def test_mosaic_segmentation_model(self,
                                     input_size,
                                     pyramid_pool_bin_nums,
                                     decoder_input_levels,
                                     decoder_stage_merge_styles):
    """Test for building and calling of a MOSAIC segmentation network."""
    num_classes = 32
    inputs = np.random.rand(2, input_size, input_size, 3)
    tf.keras.backend.set_image_data_format('channels_last')
    backbone = backbones.MobileNet(model_id='MobileNetMultiAVGSeg')
    encoder_input_level = 4

    neck = mosaic_blocks.MosaicEncoderBlock(
        encoder_input_level=encoder_input_level,
        branch_filter_depths=[64, 64],
        conv_kernel_sizes=[3, 5],
        pyramid_pool_bin_nums=pyramid_pool_bin_nums)
    head = mosaic_head.MosaicDecoderHead(
        num_classes=num_classes,
        decoder_input_levels=decoder_input_levels,
        decoder_stage_merge_styles=decoder_stage_merge_styles,
        decoder_filters=[64, 64],
        decoder_projected_filters=[32, 32])

    model = mosaic_model.MosaicSegmentationModel(
        backbone=backbone,
        head=head,
        neck=neck,
    )

    # Calls the MOSAIC model.
    outputs = model(inputs)
    level = min(decoder_input_levels)
    self.assertAllEqual(
        [2, input_size // (2**level), input_size // (2**level), num_classes],
        outputs['logits'].numpy().shape)

  def test_serialize_deserialize(self):
    """Validate the mosaic network can be serialized and deserialized."""
    num_classes = 8
    backbone = backbones.ResNet(model_id=50)
    neck = mosaic_blocks.MosaicEncoderBlock(
        encoder_input_level=4,
        branch_filter_depths=[64, 64],
        conv_kernel_sizes=[3, 5],
        pyramid_pool_bin_nums=[1, 4, 8, 16])
    head = mosaic_head.MosaicDecoderHead(
        num_classes=num_classes,
        decoder_input_levels=[3, 2],
        decoder_stage_merge_styles=['concat_merge', 'sum_merge'],
        decoder_filters=[64, 64],
        decoder_projected_filters=[32, 8])
    model = mosaic_model.MosaicSegmentationModel(
        backbone=backbone,
        head=head,
        neck=neck,
    )

    config = model.get_config()
    new_model = mosaic_model.MosaicSegmentationModel.from_config(config)

    # Validate that the config can be forced to JSON.
    _ = new_model.to_json()

    # If the serialization was successful, the new config should match the old.
    self.assertAllEqual(model.get_config(), new_model.get_config())


if __name__ == '__main__':
  tf.test.main()
