#  Copyright (c) 2022 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 numpy as np
import paddle
import paddle.static
from paddle.fluid.tests.unittests.ipu.op_test_ipu import IPUOpTest


@unittest.skipIf(not paddle.is_compiled_with_ipu(),
                 "core is not compiled with IPU")
class TestBase(IPUOpTest):

    def setUp(self):
        self.set_atol()
        self.set_training()
        self.set_attrs()
        self.set_data_feed()

    def set_training(self):
        self.is_training = False
        self.epoch = 10

    def set_attrs(self):
        self.ipu_options = {
            "batches_per_step": 1,
            "enable_pipelining": False,
            "enable_gradient_accumulation": False,
            "accumulation_factor": 1,
            "enable_replicated_graphs": False,
            "replicated_graph_count": 1,
        }
        self.cpu_bs = 1
        self.ipu_bs = 1

    def set_data_feed(self):
        np_image = np.random.rand(1, 3, 10, 10).astype(np.float32)
        self.feed_cpu = {"image": np_image}
        self.feed_ipu = {"image": np_image}

    def _test_base(self, run_ipu=True):
        scope = paddle.static.Scope()
        main_prog = paddle.static.Program()
        startup_prog = paddle.static.Program()
        main_prog.random_seed = self.SEED
        startup_prog.random_seed = self.SEED

        bs = self.ipu_bs if run_ipu else self.cpu_bs
        with paddle.static.scope_guard(scope):
            with paddle.static.program_guard(main_prog, startup_prog):
                image = paddle.static.data(name='image',
                                           shape=[bs, 3, 10, 10],
                                           dtype='float32')
                with paddle.static.ipu_shard_guard(index=0):
                    conv1 = paddle.static.nn.conv2d(image,
                                                    num_filters=3,
                                                    filter_size=3,
                                                    bias_attr=False)
                with paddle.static.ipu_shard_guard(index=1):
                    conv2 = paddle.static.nn.conv2d(conv1,
                                                    num_filters=3,
                                                    filter_size=3,
                                                    bias_attr=False)
                    # should consider influence of bs
                    loss = paddle.mean(conv2)

                if self.is_training:
                    if self.optimizer == 'sgd':
                        opt = paddle.optimizer.SGD(learning_rate=1e-2)
                    elif self.optimizer == 'adam':
                        opt = paddle.optimizer.Adam(learning_rate=1e-2)
                    elif self.optimizer == 'lamb':
                        opt = paddle.optimizer.Lamb(learning_rate=1e-2)
                    else:
                        raise Exception('optimizer must be sgd, adam or lamb')

                    opt.minimize(loss)

            if run_ipu:
                place = paddle.IPUPlace()
            else:
                place = paddle.CPUPlace()
            executor = paddle.static.Executor(place)
            executor.run(startup_prog)

            if run_ipu:
                feed_list = [image.name]
                fetch_list = [loss.name]
                ipu_strategy = paddle.static.IpuStrategy()
                ipu_strategy.set_graph_config(
                    num_ipus=2 * self.ipu_options['replicated_graph_count'],
                    is_training=self.is_training,
                    enable_manual_shard=True)
                ipu_strategy.set_options(self.ipu_options)
                program = paddle.static.IpuCompiledProgram(
                    main_prog,
                    ipu_strategy=ipu_strategy).compile(feed_list, fetch_list)
            else:
                program = main_prog

            feed = self.feed_ipu if run_ipu else self.feed_cpu
            epoch = self.epoch
            if not run_ipu:
                epoch *= self.ipu_options['replicated_graph_count']
                epoch *= self.ipu_options['batches_per_step']
                epoch *= self.ipu_options['accumulation_factor']
                epoch = epoch / (self.cpu_bs / self.ipu_bs)
            result = []
            for i in range(int(epoch)):
                loss_res = executor.run(program, feed=feed, fetch_list=[loss])
                result.append(loss_res)
            return np.array(result).flatten()

    def test(self):
        cpu_outputs = self._test_base(False)
        ipu_outputs = self._test_base(True)

        self.assertTrue(np.allclose(cpu_outputs, ipu_outputs, atol=self.atol))


class TestReplicaInference(TestBase):

    def set_attrs(self):
        self.ipu_options = {
            "batches_per_step": 1,
            "enable_pipelining": False,
            "enable_gradient_accumulation": False,
            "accumulation_factor": 1,
            "enable_replicated_graphs": True,
            "replicated_graph_count": 2,
        }
        self.cpu_bs = 1
        self.ipu_bs = 1

    def set_data_feed(self):
        np_image = np.random.rand(1, 3, 10, 10).astype(np.float32)
        self.feed_cpu = {"image": np_image}
        self.feed_ipu = {
            "image":
            np.tile(np_image,
                    [self.ipu_options['replicated_graph_count'], 1, 1, 1])
        }


class TestReplicaCollectiveInference(TestBase):

    def set_attrs(self):
        self.ipu_options = {
            "batches_per_step": 1,
            "enable_pipelining": False,
            "enable_gradient_accumulation": False,
            "accumulation_factor": 1,
            "enable_replicated_graphs": True,
            "replicated_graph_count": 2,
            "accumulate_outer_fragment": {
                0: []
            },
            "replicated_collectives_settings": {
                "prepare_schedule_for_merging_collectives": True,
                "merge_all_reduce_collectives": True
            }
        }
        self.cpu_bs = 1
        self.ipu_bs = 1

    def set_data_feed(self):
        np_image = np.random.rand(1, 3, 10, 10).astype(np.float32)
        self.feed_cpu = {"image": np_image}
        self.feed_ipu = {
            "image":
            np.tile(np_image,
                    [self.ipu_options['replicated_graph_count'], 1, 1, 1])
        }


class TestPipelineInference(TestBase):

    def set_attrs(self):
        self.ipu_options = {
            "batches_per_step": 2,
            "enable_pipelining": True,
            "enable_gradient_accumulation": False,
            "accumulation_factor": 1,
            "enable_replicated_graphs": False,
            "replicated_graph_count": 1,
        }
        self.cpu_bs = 1
        self.ipu_bs = 1

    def set_data_feed(self):
        np_image = np.random.rand(1, 3, 10, 10).astype(np.float32)
        self.feed_cpu = {"image": np_image}
        self.feed_ipu = {
            "image":
            np.tile(np_image, [self.ipu_options['batches_per_step'], 1, 1, 1])
        }


class TestTrainBase(TestBase):

    def set_training(self):
        self.is_training = True
        self.epoch = 10

    def set_attrs(self):
        self.ipu_options = {
            "batches_per_step": 1,
            "enable_pipelining": False,
            "enable_gradient_accumulation": False,
            "accumulation_factor": 1,
            "enable_replicated_graphs": False,
            "replicated_graph_count": 1,
        }
        self.cpu_bs = 1
        self.ipu_bs = 1
        self.optimizer = 'sgd'


class TestReplicaTrain(TestTrainBase):

    def set_attrs(self):
        self.ipu_options = {
            "batches_per_step": 1,
            "enable_pipelining": False,
            "enable_gradient_accumulation": False,
            "accumulation_factor": 1,
            "enable_replicated_graphs": True,
            "replicated_graph_count": 2
        }
        self.cpu_bs = 2
        self.ipu_bs = 1
        self.optimizer = 'sgd'

    def set_data_feed(self):
        np_image = np.random.rand(1, 3, 10, 10).astype(np.float32)
        self.feed_cpu = {"image": np.tile(np_image, [self.cpu_bs, 1, 1, 1])}
        self.feed_ipu = {
            "image":
            np.tile(np_image,
                    [self.ipu_options['replicated_graph_count'], 1, 1, 1])
        }

    def test(self):
        cpu_outputs = self._test_base(False)
        ipu_outputs = self._test_base(True)[::2]

        self.assertTrue(np.allclose(cpu_outputs, ipu_outputs, atol=self.atol))


class TestReplicaCollectiveTrain(TestTrainBase):

    def set_attrs(self):
        self.ipu_options = {
            "batches_per_step": 1,
            "enable_pipelining": False,
            "enable_gradient_accumulation": False,
            "accumulation_factor": 1,
            "enable_replicated_graphs": True,
            "replicated_graph_count": 2,
            "accumulate_outer_fragment": {
                0: []
            },
            "replicated_collectives_settings": {
                "prepare_schedule_for_merging_collectives": True,
                "merge_all_reduce_collectives": True
            }
        }
        self.cpu_bs = 2
        self.ipu_bs = 1
        self.optimizer = 'sgd'

    def set_data_feed(self):
        np_image = np.random.rand(1, 3, 10, 10).astype(np.float32)
        self.feed_cpu = {"image": np.tile(np_image, [self.cpu_bs, 1, 1, 1])}
        self.feed_ipu = {
            "image":
            np.tile(np_image,
                    [self.ipu_options['replicated_graph_count'], 1, 1, 1])
        }

    def test(self):
        cpu_outputs = self._test_base(False)
        ipu_outputs = self._test_base(True)[::2]

        self.assertTrue(np.allclose(cpu_outputs, ipu_outputs, atol=self.atol))


class TestPipelineTrain(TestTrainBase):

    def set_attrs(self):
        self.ipu_options = {
            "batches_per_step": 3,
            "enable_pipelining": True,
            "enable_gradient_accumulation": True,
            "accumulation_factor": 3,
            "enable_replicated_graphs": False,
            "replicated_graph_count": 1,
        }
        self.cpu_bs = 3
        self.ipu_bs = 1
        self.optimizer = 'sgd'

    def set_data_feed(self):
        np_image = np.random.rand(1, 3, 10, 10).astype(np.float32)
        self.feed_cpu = {"image": np.tile(np_image, [self.cpu_bs, 1, 1, 1])}
        bps_acc = self.ipu_options['batches_per_step'] * self.ipu_options[
            'accumulation_factor']
        self.feed_ipu = {"image": np.tile(np_image, [bps_acc, 1, 1, 1])}

    def test(self):
        cpu_outputs = self._test_base(False)
        ipu_outputs = self._test_base(True)[::3]

        self.assertTrue(np.allclose(cpu_outputs, ipu_outputs, atol=self.atol))


class TestAdamTrain(TestTrainBase):

    def set_attrs(self):
        self.ipu_options = {
            "batches_per_step": 1,
            "enable_pipelining": False,
            "enable_gradient_accumulation": False,
            "accumulation_factor": 1,
            "enable_replicated_graphs": False,
            "replicated_graph_count": 1,
        }
        self.cpu_bs = 1
        self.ipu_bs = 1
        self.optimizer = 'adam'


class TestAdamReplicaTrain(TestReplicaTrain):

    def set_attrs(self):
        self.ipu_options = {
            "batches_per_step": 1,
            "enable_pipelining": False,
            "enable_gradient_accumulation": False,
            "accumulation_factor": 1,
            "enable_replicated_graphs": True,
            "replicated_graph_count": 2,
        }
        self.cpu_bs = 2
        self.ipu_bs = 1
        self.optimizer = 'adam'


class TestAdamPipelineTrain(TestPipelineTrain):

    def set_attrs(self):
        self.ipu_options = {
            "batches_per_step": 3,
            "enable_pipelining": True,
            "enable_gradient_accumulation": True,
            "accumulation_factor": 3,
            "enable_replicated_graphs": False,
            "replicated_graph_count": 1,
        }
        self.cpu_bs = 3
        self.ipu_bs = 1
        self.optimizer = 'adam'


class TestAdamRecomputationTrain(TestPipelineTrain):

    def set_attrs(self):
        self.ipu_options = {
            "batches_per_step": 3,
            "enable_pipelining": True,
            "enable_gradient_accumulation": True,
            "accumulation_factor": 3,
            "enable_replicated_graphs": False,
            "replicated_graph_count": 1,
            "auto_recomputation": 3,
        }
        self.cpu_bs = 3
        self.ipu_bs = 1
        self.optimizer = 'adam'


class TestLambTrain(TestAdamTrain):

    def set_attrs(self):
        self.ipu_options = {
            "batches_per_step": 1,
            "enable_pipelining": False,
            "enable_gradient_accumulation": False,
            "accumulation_factor": 1,
            "enable_replicated_graphs": False,
            "replicated_graph_count": 1,
        }
        self.cpu_bs = 1
        self.ipu_bs = 1
        self.optimizer = 'lamb'


class TestLambReplicaTrain(TestAdamReplicaTrain):

    def set_attrs(self):
        self.ipu_options = {
            "batches_per_step": 1,
            "enable_pipelining": False,
            "enable_gradient_accumulation": False,
            "accumulation_factor": 1,
            "enable_replicated_graphs": True,
            "replicated_graph_count": 2,
        }
        self.cpu_bs = 2
        self.ipu_bs = 1
        self.optimizer = 'lamb'


class TestLambPipelineTrain(TestAdamPipelineTrain):

    def set_attrs(self):
        self.ipu_options = {
            "batches_per_step": 3,
            "enable_pipelining": True,
            "enable_gradient_accumulation": True,
            "accumulation_factor": 3,
            "enable_replicated_graphs": False,
            "replicated_graph_count": 1,
        }
        self.cpu_bs = 3
        self.ipu_bs = 1
        self.optimizer = 'lamb'


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