# 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. import unittest import paddle import paddle.fluid.core as core import paddle.fluid as fluid from paddle.fluid.backward import append_backward import paddle.fluid.framework as framework from paddle.fluid.framework import Program, switch_main_program import bisect import numpy as np fluid.default_startup_program().random_seed = 1 class TestDyRnnStaticInput(unittest.TestCase): def setUp(self): self._delta = 0.005 self._max_sequence_len = 3 self._program = Program() switch_main_program(self._program) self.output_dim = 10 self.place = core.CPUPlace() self.prepare_x_tensor() self.prepare_static_input_tensor() self.exe = fluid.Executor(self.place) def prepare_x_tensor(self): self.x_tensor_dim = 10 lod = [[2, 1, 3]] shape = [sum(lod[0]), self.x_tensor_dim] self.x_tensor_data = np.random.random(shape).astype('float32') self.x_tensor = core.LoDTensor() self.x_tensor.set_recursive_sequence_lengths(lod) self.x_tensor.set(self.x_tensor_data, self.place) def prepare_static_input_tensor(self): self.static_input_tensor_dim = 4 lod = [[1, 2, 3]] shape = [sum(lod[0]), self.static_input_tensor_dim] self.static_input_data = np.random.random(shape).astype('float32') self.static_input_tensor = core.LoDTensor() self.static_input_tensor.set_recursive_sequence_lengths(lod) self.static_input_tensor.set(self.static_input_data, self.place) def fetch_value(self, var): fetch_outs = self.exe.run(feed={ 'x_tensor': self.x_tensor, 'static_input_tensor': self.static_input_tensor }, fetch_list=[var], return_numpy=False) return self._lodtensor_to_ndarray(fetch_outs[0]) def _lodtensor_to_ndarray(self, lod_tensor): dims = lod_tensor.shape() ndarray = np.zeros(shape=dims).astype('float32') for i in xrange(np.product(dims)): ndarray.ravel()[i] = lod_tensor._get_float_element(i) return ndarray, lod_tensor.recursive_sequence_lengths() def build_graph(self, only_forward=False): x_tensor = fluid.layers.data( name='x_tensor', shape=[self.x_tensor_dim], dtype='float32', lod_level=1) x_tensor.stop_gradient = False static_input_tensor = fluid.layers.data( name='static_input_tensor', shape=[self.static_input_tensor_dim], dtype='float32', lod_level=1) static_input_tensor.stop_gradient = False if only_forward: static_input_out_array = self._program.global_block().create_var( name='static_input_out_array', type=core.VarDesc.VarType.LOD_TENSOR_ARRAY, dtype='float32') static_input_out_array.stop_gradient = True rnn = fluid.layers.DynamicRNN() with rnn.block(): step_x = rnn.step_input(x_tensor) step_static_input = rnn.static_input(static_input_tensor) if only_forward: fluid.layers.array_write( x=step_static_input, i=rnn.step_idx, array=static_input_out_array) last = fluid.layers.sequence_pool( input=step_static_input, pool_type='last') projected = fluid.layers.fc(input=[step_x, last], size=self.output_dim) rnn.output(projected) if only_forward: static_input_step_outs = [] step_idx = fluid.layers.fill_constant( shape=[1], dtype='int64', value=0) step_idx.stop_gradient = True for i in xrange(self._max_sequence_len): step_out = fluid.layers.array_read(static_input_out_array, step_idx) step_out.stop_gradient = True static_input_step_outs.append(step_out) fluid.layers.increment(x=step_idx, value=1.0, in_place=True) if only_forward: return static_input_step_outs last = fluid.layers.sequence_pool(input=rnn(), pool_type='last') loss = fluid.layers.mean(last) append_backward(loss) static_input_grad = self._program.global_block().var( framework.grad_var_name('static_input_tensor')) return static_input_grad, loss def get_expected_static_step_outs(self): x_lod = self.x_tensor.recursive_sequence_lengths() x_seq_len = x_lod[0] x_seq_len_sorted = sorted(x_seq_len) x_sorted_indices = np.argsort(x_seq_len)[::-1] static_lod = self.static_input_tensor.recursive_sequence_lengths() static_sliced = [] cur_offset = 0 for i in xrange(len(static_lod[0])): static_sliced.append(self.static_input_data[cur_offset:( cur_offset + static_lod[0][i])]) cur_offset += static_lod[0][i] static_seq_len = static_lod[0] static_reordered = [] for i in xrange(len(x_sorted_indices)): static_reordered.extend(static_sliced[x_sorted_indices[i]].tolist()) static_seq_len_reordered = [ static_seq_len[x_sorted_indices[i]] for i in xrange(len(x_sorted_indices)) ] static_step_outs = [] static_step_lods = [] for i in xrange(self._max_sequence_len): end = len(x_seq_len) - bisect.bisect_left(x_seq_len_sorted, i + 1) lod = [] total_len = 0 for i in xrange(end): lod.append(static_seq_len_reordered[i]) total_len += lod[-1] static_step_lods.append([lod]) end = total_len static_step_outs.append( np.array(static_reordered[:end]).astype('float32')) return static_step_outs, static_step_lods def test_step_out(self): static_step_outs = self.build_graph(only_forward=True) self.exe.run(framework.default_startup_program()) expected_outs, expected_lods = self.get_expected_static_step_outs() for i in xrange(self._max_sequence_len): step_out, lod = self.fetch_value(static_step_outs[i]) self.assertTrue(np.allclose(step_out, expected_outs[i])) self.assertTrue(np.allclose(lod, expected_lods[i])) def test_network_gradient(self): static_input_grad, loss = self.build_graph() self.exe.run(framework.default_startup_program()) actual_gradients, actual_lod = self.fetch_value(static_input_grad) static_input_shape = self.static_input_tensor.shape() numeric_gradients = np.zeros(shape=static_input_shape).astype('float32') # calculate numeric gradients tensor_size = np.product(static_input_shape) for i in xrange(tensor_size): origin = self.static_input_tensor._get_float_element(i) x_pos = origin + self._delta self.static_input_tensor._set_float_element(i, x_pos) y_pos = self.fetch_value(loss)[0][0] x_neg = origin - self._delta self.static_input_tensor._set_float_element(i, x_neg) y_neg = self.fetch_value(loss)[0][0] self.static_input_tensor._set_float_element(i, origin) numeric_gradients.ravel()[i] = (y_pos - y_neg) / self._delta / 2 self.assertTrue(np.allclose(actual_gradients, numeric_gradients, 0.001)) self.assertTrue( np.allclose(actual_lod, self.static_input_tensor.recursive_sequence_lengths())) if __name__ == '__main__': unittest.main()