import unittest

import paddle.v2.framework.framework as framework
import paddle.v2.framework.optimizer as optimizer
import paddle.v2.framework.regularizer as regularizer
from paddle.v2.framework.backward import append_backward_ops


class TestL2DecayRegularizer(unittest.TestCase):
    def test_l2decay_regularizer(self):
        program = framework.Program()
        block = program.global_block()
        mul_x = block.create_parameter(
            dtype="float32",
            shape=[5, 10],
            lod_level=0,
            name="mul.x",
            regularizer=regularizer.L2DecayRegularizer(0.5))
        self.assertTrue(mul_x.regularizer is not None)
        self.assertTrue(
            isinstance(mul_x.regularizer, regularizer.L2DecayRegularizer))
        mul_y = block.create_var(
            dtype="float32", shape=[10, 8], lod_level=0, name="mul.y")
        mul_out = block.create_var(
            dtype="float32", shape=[5, 8], lod_level=0, name="mul.out")
        block.append_op(
            type="mul",
            inputs={"X": mul_x,
                    "Y": mul_y},
            outputs={"Out": mul_out},
            attrs={"x_num_col_dims": 1})
        params_grads = append_backward_ops(mul_out)
        self.assertEqual(len(params_grads), 1)
        count_ops = len(block.ops)
        params_grads = optimizer.append_regularization_ops(params_grads)
        self.assertEqual(len(params_grads), 1)
        self.assertEqual(len(block.ops), count_ops + 2)
        self.assertEqual(block.ops[-1].type, 'elementwise_add')
        self.assertEqual(block.ops[-2].type, 'scale')


if __name__ == '__main__':
    unittest.main()