/* Copyright (c) 2016 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. */

#include "paddle/fluid/framework/prune.h"

#include <gtest/gtest.h>
#include <set>
#include <string>
#include <vector>

#include "paddle/fluid/framework/attribute.h"
#include "paddle/fluid/framework/operator.h"

#include "paddle/fluid/framework/block_desc.h"
#include "paddle/fluid/framework/op_desc.h"
#include "paddle/fluid/framework/program_desc.h"

namespace f = paddle::framework;

void AddOp(const std::string &type, const f::VariableNameMap &inputs,
           const f::VariableNameMap &outputs, f::AttributeMap attrs,
           paddle::framework::BlockDesc *block) {
  // insert output
  for (auto kv : outputs) {
    for (auto v : kv.second) {
      auto var = block->Var(v);
      var->SetDataType(paddle::framework::proto::VarType::FP32);
    }
  }

  // insert op
  auto op = block->AppendOp();
  op->SetType(type);
  for (auto &kv : inputs) {
    op->SetInput(kv.first, kv.second);
  }
  for (auto &kv : outputs) {
    op->SetOutput(kv.first, kv.second);
  }
  op->SetAttrMap(attrs);
}

TEST(Prune, one_operator) {
  f::ProgramDesc program;
  f::BlockDesc *block = program.MutableBlock(0);

  AddOp("one_one", {{"input", {"a"}}}, {{"output", {"b"}}}, f::AttributeMap{},
        block);

  f::proto::ProgramDesc *pdesc = program.Proto();
  f::proto::ProgramDesc pruned;
  std::set<std::string> feed_var_names = {};
  f::Prune(*pdesc, feed_var_names, &pruned);
  EXPECT_EQ(pruned.blocks(0).ops_size(), 0);

  feed_var_names.insert("a");
  pdesc->mutable_blocks(0)->mutable_ops(0)->set_is_target(true);
  f::Prune(*pdesc, feed_var_names, &pruned);
  EXPECT_EQ(pruned.blocks(0).ops_size(), 1);
}

TEST(Prune, forward) {
  f::ProgramDesc program;
  f::BlockDesc *block = program.MutableBlock(0);

  AddOp("one_one", {{"input", {"a"}}}, {{"output", {"b"}}}, f::AttributeMap{},
        block);
  AddOp("one_one", {{"input", {"b"}}}, {{"output", {"c"}}}, f::AttributeMap{},
        block);
  AddOp("one_one", {{"input", {"c"}}}, {{"output", {"d"}}}, f::AttributeMap{},
        block);
  AddOp("one_one", {{"input", {"d"}}}, {{"output", {"e"}}}, f::AttributeMap{},
        block);

  f::proto::ProgramDesc *pdesc = program.Proto();
  std::set<std::string> feed_var_names = {"a"};
  for (int i = 0; i < pdesc->blocks(0).ops_size(); ++i) {
    f::proto::ProgramDesc pruned;
    pdesc->mutable_blocks(0)->mutable_ops(i)->set_is_target(true);
    f::Prune(*pdesc, feed_var_names, &pruned);
    EXPECT_EQ(pruned.blocks(0).ops_size(), i + 1);
  }
}

TEST(Prune, multi_input_op) {
  f::ProgramDesc program;
  f::BlockDesc *block = program.MutableBlock(0);

  AddOp("one_one", {{"input", {"a0"}}}, {{"output", {"b0"}}}, f::AttributeMap{},
        block);
  AddOp("one_one", {{"input", {"a1"}}}, {{"output", {"b1"}}}, f::AttributeMap{},
        block);
  AddOp("one_one", {{"input", {"a2"}}}, {{"output", {"b2"}}}, f::AttributeMap{},
        block);
  AddOp("three_one", {{"input", {"b0", "b1", "b2"}}}, {{"output", {"c"}}},
        f::AttributeMap{}, block);

  f::proto::ProgramDesc *pdesc = program.Proto();
  pdesc->mutable_blocks(0)->mutable_ops(3)->set_is_target(true);

  f::proto::ProgramDesc pruned;
  std::set<std::string> feed_var_names = {"a0", "a1", "a2"};
  f::Prune(*pdesc, feed_var_names, &pruned);
  EXPECT_EQ(pruned.blocks(0).ops_size(), 4);
}

TEST(Prune, multi_output_op) {
  f::ProgramDesc program;
  f::BlockDesc *block = program.MutableBlock(0);

  AddOp("one_two", {{"input", {"a"}}}, {{"output", {"b", "c"}}},
        f::AttributeMap{}, block);
  AddOp("one_one", {{"input", {"b"}}}, {{"output", {"b1"}}}, f::AttributeMap{},
        block);
  AddOp("one_one", {{"input", {"c"}}}, {{"output", {"c1"}}}, f::AttributeMap{},
        block);

  f::proto::ProgramDesc *pdesc = program.Proto();
  pdesc->mutable_blocks(0)->mutable_ops(2)->set_is_target(true);

  f::proto::ProgramDesc pruned;
  std::set<std::string> feed_var_names = {"a"};
  f::Prune(*pdesc, feed_var_names, &pruned);
  EXPECT_EQ(pruned.blocks(0).ops_size(), 2);
}

TEST(Prune, multi_target) {
  f::ProgramDesc program;
  f::BlockDesc *block = program.MutableBlock(0);

  AddOp("one_two", {{"input", {"a"}}}, {{"output", {"b", "c"}}},
        f::AttributeMap{}, block);
  AddOp("one_one", {{"input", {"b"}}}, {{"output", {"b1"}}}, f::AttributeMap{},
        block);
  AddOp("one_one", {{"input", {"c"}}}, {{"output", {"c1"}}}, f::AttributeMap{},
        block);

  f::proto::ProgramDesc *pdesc = program.Proto();
  pdesc->mutable_blocks(0)->mutable_ops(1)->set_is_target(true);
  pdesc->mutable_blocks(0)->mutable_ops(2)->set_is_target(true);

  f::proto::ProgramDesc pruned;
  std::set<std::string> feed_var_names = {"a"};
  f::Prune(*pdesc, feed_var_names, &pruned);
  EXPECT_EQ(pruned.blocks(0).ops_size(), 3);
}

TEST(Prune, recurrrent_op) {
  f::ProgramDesc program;
  f::BlockDesc *block = program.MutableBlock(0);
  f::BlockDesc *sub_block = program.AppendBlock(*block);
  AddOp("one_two", {{"input", {"a"}}}, {{"output", {"b", "c"}}},
        f::AttributeMap{}, block);

  std::vector<std::string> state_var_name(1, "y");
  AddOp("recurrent", {{"input", {"b", "c"}}}, {{"output", {"b1, c1"}}},
        {{"ex_states", state_var_name},
         {"states", state_var_name},
         {"sub_block", sub_block}},
        block);

  EXPECT_TRUE(sub_block != nullptr);
  AddOp("rnn_memory_helper", {{"input", {"x"}}}, {{"output", {"y"}}},
        f::AttributeMap{}, sub_block);

  f::proto::ProgramDesc *pdesc = program.Proto();
  pdesc->mutable_blocks(0)->mutable_ops(1)->set_is_target(true);

  f::proto::ProgramDesc pruned;
  std::set<std::string> feed_var_names = {"a"};

  f::Prune(*pdesc, feed_var_names, &pruned);
  EXPECT_EQ(pruned.blocks_size(), 2);
  EXPECT_EQ(pruned.blocks(0).ops_size(), 2);
  EXPECT_EQ(pruned.blocks(1).ops_size(), 1);
}

// If the output of an op modifies feed vars, the op should not clip.
TEST(Prune, recurrrent_op_2) {
  f::ProgramDesc program;
  f::BlockDesc *block = program.MutableBlock(0);
  f::BlockDesc *sub_block = program.AppendBlock(*block);
  AddOp("one_two", {{"input", {"a"}}}, {{"output", {"b", "c"}}},
        f::AttributeMap{}, block);

  std::vector<std::string> state_var_name(1, "y");
  AddOp("recurrent", {{"input", {"b", "c"}}}, {{"output", {"b1, c1"}}},
        {{"ex_states", state_var_name},
         {"states", state_var_name},
         {"sub_block", sub_block}},
        block);

  EXPECT_TRUE(sub_block != nullptr);
  AddOp("rnn_memory_helper", {{"input", {"x"}}}, {{"output", {"a"}}},
        f::AttributeMap{}, sub_block);

  f::proto::ProgramDesc *pdesc = program.Proto();
  pdesc->mutable_blocks(0)->mutable_ops(1)->set_is_target(true);

  f::proto::ProgramDesc pruned;
  std::set<std::string> feed_var_names = {"x", "a"};

  f::Prune(*pdesc, feed_var_names, &pruned);
  EXPECT_EQ(pruned.blocks_size(), 2);
  EXPECT_EQ(pruned.blocks(0).ops_size(), 2);
  EXPECT_EQ(pruned.blocks(1).ops_size(), 1);
}