# Copyright 2021 The TensorFlow Authors. All Rights Reserved.
#
# 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
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
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"""Tests for yolo heads."""

from absl.testing import parameterized
import tensorflow as tf

from official.vision.beta.projects.yolo.losses import yolo_loss


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

  @parameterized.parameters(
      (True),
      (False),
  )
  def test_loss_init(self, scaled):
    """Test creation of YOLO family models."""

    def inpdict(input_shape, dtype=tf.float32):
      inputs = {}
      for key in input_shape:
        inputs[key] = tf.ones(input_shape[key], dtype=dtype)
      return inputs

    tf.keras.backend.set_image_data_format('channels_last')
    input_shape = {
        '3': [1, 52, 52, 255],
        '4': [1, 26, 26, 255],
        '5': [1, 13, 13, 255]
    }
    classes = 80
    anchors = {
        '3': [[12.0, 19.0], [31.0, 46.0], [96.0, 54.0]],
        '4': [[46.0, 114.0], [133.0, 127.0], [79.0, 225.0]],
        '5': [[301.0, 150.0], [172.0, 286.0], [348.0, 340.0]]
    }
    keys = ['3', '4', '5']
    path_strides = {key: 2**int(key) for key in keys}

    loss = yolo_loss.YoloLoss(
        keys,
        classes,
        anchors,
        path_strides=path_strides,
        truth_thresholds={key: 1.0 for key in keys},
        ignore_thresholds={key: 0.7 for key in keys},
        loss_types={key: 'ciou' for key in keys},
        iou_normalizers={key: 0.05 for key in keys},
        cls_normalizers={key: 0.5 for key in keys},
        object_normalizers={key: 1.0 for key in keys},
        objectness_smooths={key: 1.0 for key in keys},
        box_types={key: 'scaled' for key in keys},
        scale_xys={key: 2.0 for key in keys},
        max_deltas={key: 30.0 for key in keys},
        label_smoothing=0.0,
        use_scaled_loss=scaled,
        update_on_repeat=True)

    count = inpdict({
        '3': [1, 52, 52, 3, 1],
        '4': [1, 26, 26, 3, 1],
        '5': [1, 13, 13, 3, 1]
    })
    ind = inpdict({
        '3': [1, 300, 3],
        '4': [1, 300, 3],
        '5': [1, 300, 3]
    }, tf.int32)
    truths = inpdict({'3': [1, 300, 6], '4': [1, 300, 6], '5': [1, 300, 6]})
    boxes = tf.ones([1, 300, 4], dtype=tf.float32)
    classes = tf.ones([1, 300], dtype=tf.float32)

    gt = {
        'true_conf': count,
        'inds': ind,
        'upds': truths,
        'bbox': boxes,
        'classes': classes
    }

    _, _, _ = loss(gt, inpdict(input_shape))


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