text: #   Copyright (c) 2018 PaddlePaddle 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,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  
  from __future__ import print_function
  
  import unittest
  import numpy as np
  from op_test import OpTest
  
  
  class TestRankLossOp(OpTest):
      def setUp(self):
          self.op_type = "rank_loss"
          shape = (100, 1)
          # labels_{i} = {0, 1.0} or {0, 0.5, 1.0}
          label_shape, left_shape, right_shape = self.set_shape()
          label = np.random.randint(0, 2, size=shape).astype("float32")
          left = np.random.random(shape).astype("float32")
          right = np.random.random(shape).astype("float32")
          loss = np.log(1.0 + np.exp(left - right)) - label * (left - right)
          loss = np.reshape(loss, label_shape)
          self.inputs = {
              'Label': label.reshape(label_shape),
              'Left': left.reshape(left_shape),
              'Right': right.reshape(right_shape)
          }
          self.outputs = {'Out': loss.reshape(label_shape)}
  
      def set_shape(self):
          batch_size = 100
          return (batch_size, 1), (batch_size, 1), (batch_size, 1)
  
      def test_check_output(self):
          self.check_output()
  
      def test_check_grad(self):
          self.check_grad(["Left", "Right"], "Out")
  
      def test_check_grad_ignore_left(self):
          self.check_grad(["Right"], "Out", no_grad_set=set('Left'))
  
      def test_check_grad_ignore_right(self):
          self.check_grad(["Left"], "Out", no_grad_set=set('Right'))
  
  
  class TestRankLossOp1(TestRankLossOp):
      def set_shape(self):
          batch_size = 100
          return (batch_size), (batch_size, 1), (batch_size, 1)
  
  
  class TestRankLossOp2(TestRankLossOp):
      def set_shape(self):
          batch_size = 100
          return (batch_size, 1), (batch_size), (batch_size, 1)
  
  
  class TestRankLossOp3(TestRankLossOp):
      def set_shape(self):
          batch_size = 100
          return (batch_size, 1), (batch_size, 1), (batch_size)
  
  
  class TestRankLossOp4(TestRankLossOp):
      def set_shape(self):
          batch_size = 100
          return (batch_size), (batch_size), (batch_size, 1)
  
  
  class TestRankLossOp5(TestRankLossOp):
      def set_shape(self):
          batch_size = 100
          return (batch_size), (batch_size), (batch_size)
  
  
  if __name__ == '__main__':
      unittest.main()
  