#   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
"""Defination of Server and Worker."""

from . import ps_pb2 as pslib

# NOTE: reduce removed in fuctools in python3
from functools import reduce


class Server:
    """
    A Server basic class
    it's a base class, does not have implementation
    """

    def __init__(self):
        pass


class Worker:
    """
    A Worker basic class.
    it's a base class, does not have implementation
    """

    def __init__(self):
        pass


class DownpourServer(Server):
    """
    DownpourServer class is used to generate server program_desc
    Args:
        server: it is pslib.ServerParameter()
    Examples:
        server = DownpourServer()
    """

    def __init__(self):
        self._server = pslib.ServerParameter()
        self._server.downpour_server_param.service_param.server_class = (
            "DownpourBrpcPsServer"
        )
        self._server.downpour_server_param.service_param.client_class = (
            "DownpourBrpcPsClient"
        )
        self._server.downpour_server_param.service_param.service_class = (
            "DownpourPsService"
        )
        self._server.downpour_server_param.service_param.start_server_port = 0
        self._server.downpour_server_param.service_param.server_thread_num = 12

    def add_sparse_table(self, table_id, strategy):
        """
        Args:
            table_id(int): id of sparse params table
            strategy(dict): the config dict.
        Returns:
            return None
        """

        for table in self._server.downpour_server_param.downpour_table_param:
            if table.table_id == table_id:
                if table.type == pslib.PS_SPARSE_TABLE:
                    return
                else:
                    raise ValueError(
                        "expect table %s type=%s, but actual type=%s"
                        % (table_id, pslib.PS_SPARSE_TABLE, table.type)
                    )
        if strategy is None:
            strategy = dict()
        table = self._server.downpour_server_param.downpour_table_param.add()
        table.table_id = table_id
        table.type = pslib.PS_SPARSE_TABLE

        support_sparse_key_list = [
            'sparse_table_class',
            'sparse_compress_in_save',
            'sparse_shard_num',
            'sparse_accessor_class',
            'sparse_learning_rate',
            'sparse_initial_g2sum',
            'sparse_initial_range',
            'sparse_weight_bounds',
            'sparse_embedx_dim',
            'sparse_embedx_threshold',
            'sparse_nonclk_coeff',
            'sparse_click_coeff',
            'sparse_base_threshold',
            'sparse_delta_threshold',
            'sparse_delta_keep_days',
            'sparse_delete_after_unseen_days',
            'sparse_show_click_decay_rate',
            'sparse_delete_threshold',
            'sparse_converter',
            'sparse_deconverter',
            'sparse_enable_cache',
            'sparse_cache_rate',
            'sparse_cache_file_num',
            'sparse_beta1_decay_rate',
            'sparse_beta2_decay_rate',
            'sparse_ada_epsilon',
            'sparse_optimizer',
            'sparse_ssd_unseenday_threshold',
            'embed_sparse_optimizer',
            'embed_sparse_learning_rate',
            'embed_sparse_weight_bounds',
            'embed_sparse_initial_range',
            'embed_sparse_initial_g2sum',
            'embed_sparse_beta1_decay_rate',
            'embed_sparse_beta2_decay_rate',
            'embedx_sparse_optimizer',
            'embedx_sparse_learning_rate',
            'embedx_sparse_weight_bounds',
            'embedx_sparse_initial_range',
            'embedx_sparse_initial_g2sum',
            'embedx_sparse_beta1_decay_rate',
            'embedx_sparse_beta2_decay_rate',
        ]

        for key in strategy:
            if key not in support_sparse_key_list:
                raise ValueError("strategy key '%s' not support" % (key))

        support_table_calss = ['DownpourSparseTable', 'DownpourSparseSSDTable']
        if strategy.get('sparse_table_class') is not None:
            table_class = strategy.get('sparse_table_class')
            if table_class not in support_table_calss:
                raise ValueError(
                    "support sparse_table_class: [ 'DownpourSparseTable', 'DownpourSparseSSDTable'], \
                        but actual %s"
                    % (table_class)
                )
        else:
            table_class = 'DownpourSparseTable'

        table.table_class = table_class

        if (
            table_class == 'DownpourSparseTable'
            or table_class == 'DownpourSparseSSDTable'
        ):
            table.enable_sparse_table_cache = strategy.get(
                'sparse_enable_cache', True
            )
            table.sparse_table_cache_rate = strategy.get(
                'sparse_cache_rate', 0.00055
            )
            table.sparse_table_cache_file_num = strategy.get(
                'sparse_cache_file_num', 16
            )
            table.compress_in_save = strategy.get(
                'sparse_compress_in_save', True
            )
            table.shard_num = strategy.get('sparse_shard_num', 1000)
            # DownpourFeatureValueAccessor: for ctr task, has cvm, embedding and sgd info
            # DownpourCtrAccessor         : for ctr task, has cvm, slot, embedding and sgd info
            # DownpourSparseValueAccessor : for general task, has embedding and sgd info
            # DownpourCtrDoubleAccessor   : for ctr task, which show clk are in double
            # DownpourUnitAccessor        : for ctr task, has cvm, slot, embedding and sgd info

            support_accessor_class = [
                'DownpourFeatureValueAccessor',
                'DownpourCtrAccessor',
                'DownpourCtrDymfAccessor',
                'DownpourSparseValueAccessor',
                'DownpourCtrDoubleAccessor',
                'DownpourUnitAccessor',
                'DownpourDoubleUnitAccessor',
            ]
            if strategy.get('sparse_accessor_class') is not None:
                accessor_class = strategy.get('sparse_accessor_class')
                if accessor_class not in support_accessor_class:
                    raise ValueError(
                        "support sparse_accessor_class: ['DownpourFeatureValueAccessor', 'DownpourCtrAccessor', 'DownpourCtrDymfAccessor', \
                        'DownpourSparseValueAccessor', 'DownpourCtrDoubleAccessor'], \
                            but actual %s"
                        % (accessor_class)
                    )
            else:
                accessor_class = 'DownpourCtrAccessor'

            table.accessor.accessor_class = accessor_class

            if (
                accessor_class == 'DownpourFeatureValueAccessor'
                or accessor_class == 'DownpourCtrAccessor'
                or accessor_class == 'DownpourCtrDymfAccessor'
                or accessor_class == 'DownpourCtrDoubleAccessor'
            ):
                table.accessor.sparse_sgd_param.learning_rate = strategy.get(
                    'sparse_learning_rate', 0.05
                )
                table.accessor.sparse_sgd_param.initial_g2sum = strategy.get(
                    'sparse_initial_g2sum', 3
                )
                table.accessor.sparse_sgd_param.initial_range = strategy.get(
                    'sparse_initial_range', 1e-4
                )
                if strategy.get('sparse_weight_bounds') is None:
                    table.accessor.sparse_sgd_param.weight_bounds.extend(
                        [-10, 10]
                    )
                else:
                    table.accessor.sparse_sgd_param.weight_bounds.extend(
                        strategy.get('sparse_weight_bounds')
                    )
                table.accessor.embedx_dim = strategy.get('sparse_embedx_dim', 8)
                table.accessor.embedx_threshold = strategy.get(
                    'sparse_embedx_threshold', 10
                )
                table.accessor.fea_dim = int(table.accessor.embedx_dim) + 3
                table.accessor.downpour_accessor_param.nonclk_coeff = (
                    strategy.get('sparse_nonclk_coeff', 0.1)
                )
                table.accessor.downpour_accessor_param.click_coeff = (
                    strategy.get('sparse_click_coeff', 1)
                )
                table.accessor.downpour_accessor_param.base_threshold = (
                    strategy.get('sparse_base_threshold', 1.5)
                )
                table.accessor.downpour_accessor_param.delta_threshold = (
                    strategy.get('sparse_delta_threshold', 0.25)
                )
                table.accessor.downpour_accessor_param.delta_keep_days = (
                    strategy.get('sparse_delta_keep_days', 16)
                )
                table.accessor.downpour_accessor_param.delete_after_unseen_days = strategy.get(
                    'sparse_delete_after_unseen_days', 30
                )
                table.accessor.downpour_accessor_param.ssd_unseenday_threshold = strategy.get(
                    'sparse_ssd_unseenday_threshold', 1
                )
                table.accessor.downpour_accessor_param.show_click_decay_rate = (
                    strategy.get('sparse_show_click_decay_rate', 0.98)
                )
                table.accessor.downpour_accessor_param.delete_threshold = (
                    strategy.get('sparse_delete_threshold', 0.8)
                )
                converter = strategy.get(
                    'sparse_converter',
                    "(scripts/xbox_compressor_mf.py | bin/xbox_pb_converter)",
                )
                deconverter = strategy.get(
                    'sparse_deconverter',
                    "(bin/xbox_pb_deconverter | scripts/xbox_decompressor_mf.awk)",
                )

                table1 = table.accessor.table_accessor_save_param.add()
                table1.param = 1
                table1.converter = converter
                table1.deconverter = deconverter

                table2 = table.accessor.table_accessor_save_param.add()
                table2.param = 2
                table2.converter = converter
                table2.deconverter = deconverter
            elif accessor_class == 'DownpourSparseValueAccessor':
                optimizer_name = strategy.get("sparse_optimizer", "adam")
                table.accessor.sparse_commonsgd_param.name = optimizer_name
                table.accessor.embedx_dim = strategy.get('sparse_embedx_dim', 8)
                table.accessor.fea_dim = int(table.accessor.embedx_dim)
                if optimizer_name == "naive":
                    table.accessor.sparse_commonsgd_param.naive.learning_rate = strategy.get(
                        'sparse_learning_rate', 0.05
                    )
                    table.accessor.sparse_commonsgd_param.naive.initial_range = strategy.get(
                        'sparse_initial_range', 1e-4
                    )
                    if strategy.get('sparse_weight_bounds') is None:
                        table.accessor.sparse_commonsgd_param.naive.weight_bounds.extend(
                            [-10, 10]
                        )
                    else:
                        table.accessor.sparse_commonsgd_param.naive.weight_bounds.extend(
                            strategy.get('sparse_weight_bounds')
                        )
                elif optimizer_name == "adagrad":
                    table.accessor.sparse_commonsgd_param.adagrad.learning_rate = strategy.get(
                        'sparse_learning_rate', 0.05
                    )
                    table.accessor.sparse_commonsgd_param.adagrad.initial_range = strategy.get(
                        'sparse_initial_range', 1e-4
                    )
                    table.accessor.sparse_commonsgd_param.adagrad.initial_g2sum = strategy.get(
                        'sparse_initial_g2sum', 3
                    )
                    if strategy.get('sparse_weight_bounds') is None:
                        table.accessor.sparse_commonsgd_param.adagrad.weight_bounds.extend(
                            [-10, 10]
                        )
                    else:
                        table.accessor.sparse_commonsgd_param.adagrad.weight_bounds.extend(
                            strategy.get('sparse_weight_bounds')
                        )
                elif optimizer_name == "adam":
                    table.accessor.sparse_commonsgd_param.adam.learning_rate = (
                        strategy.get('sparse_learning_rate', 0.001)
                    )
                    table.accessor.sparse_commonsgd_param.adam.initial_range = (
                        strategy.get('sparse_initial_range', 1e-4)
                    )
                    table.accessor.sparse_commonsgd_param.adam.beta1_decay_rate = strategy.get(
                        'sparse_beta1_decay_rate', 0.9
                    )
                    table.accessor.sparse_commonsgd_param.adam.beta2_decay_rate = strategy.get(
                        'sparse_beta2_decay_rate', 0.999
                    )
                    table.accessor.sparse_commonsgd_param.adam.ada_epsilon = (
                        strategy.get('sparse_ada_epsilon', 1e-8)
                    )
                    if strategy.get('sparse_weight_bounds') is None:
                        table.accessor.sparse_commonsgd_param.adam.weight_bounds.extend(
                            [-10, 10]
                        )
                    else:
                        table.accessor.sparse_commonsgd_param.adam.weight_bounds.extend(
                            strategy.get('sparse_weight_bounds')
                        )
                converter = strategy.get(
                    'sparse_converter',
                    "(scripts/xbox_compressor_mf.py | bin/xbox_pb_converter)",
                )
                deconverter = strategy.get(
                    'sparse_deconverter',
                    "(bin/xbox_pb_deconverter | scripts/xbox_decompressor_mf.awk)",
                )

                table1 = table.accessor.table_accessor_save_param.add()
                table1.param = 1
                table1.converter = converter
                table1.deconverter = deconverter

                table2 = table.accessor.table_accessor_save_param.add()
                table2.param = 2
                table2.converter = converter
                table2.deconverter = deconverter
            elif (
                accessor_class == 'DownpourUnitAccessor'
                or accessor_class == 'DownpourDoubleUnitAccessor'
            ):
                self.add_sparse_table_common_config(table, strategy)
                self.add_sparse_optimizer(
                    table.accessor.embed_sgd_param, strategy, "embed_"
                )
                self.add_sparse_optimizer(
                    table.accessor.embedx_sgd_param, strategy, "embedx_"
                )

    def add_dense_table(
        self, table_id, param_var, grad_var, strategy, sparse_table_names
    ):
        """
        Args:
            table_id(int): id of sparse params table
            param_var(list): param vars
            grad_var(list): param grad vars
            strategy(dict): the dense config dict
            sparse_table_names(list): sparse table names
        Returns:
            return None
        """
        fea_dim = 0
        dense_param_vars = []
        for p in param_var:
            if p.name not in sparse_table_names:
                dense_param_vars.append(p)

        for param in dense_param_vars:
            fea_dim += reduce(lambda x, y: x * y, param.shape, 1)

        for table in self._server.downpour_server_param.downpour_table_param:
            if table.table_id == table_id:
                if table.type == pslib.PS_DENSE_TABLE:
                    table.accessor.fea_dim = fea_dim
                    return
                else:
                    raise ValueError(
                        "expect table %s type=%s, but actual type=%s"
                        % (table_id, pslib.PS_DENSE_TABLE, table.type)
                    )

        if strategy is None:
            strategy = dict()
        table = self._server.downpour_server_param.downpour_table_param.add()
        table.table_id = table_id
        support_dense_key_list = [
            'dense_table_class',
            'dense_compress_in_save',
            'dense_accessor_class',
            'dense_optimizer',
            'dense_learning_rate',
            'dense_avg_decay',
            'dense_ada_decay',
            'dense_ada_epsilon',
            'dense_mom_decay',
            'dense_naive_lr',
        ]

        for key in strategy:
            if key not in support_dense_key_list:
                raise ValueError("strategy key '%s' not support" % (key))

        table.table_class = strategy.get(
            'dense_table_class', "DownpourDenseTable"
        )
        table.type = pslib.PS_DENSE_TABLE
        table.compress_in_save = strategy.get('dense_compress_in_save', True)
        table.accessor.accessor_class = strategy.get(
            'dense_accessor_class', "DownpourDenseValueAccessor"
        )
        table.accessor.dense_sgd_param.name = strategy.get(
            'dense_optimizer', "adam"
        )
        table.accessor.dense_sgd_param.adam.learning_rate = strategy.get(
            'dense_learning_rate', 5e-06
        )
        table.accessor.dense_sgd_param.adam.avg_decay_rate = strategy.get(
            'dense_avg_decay', 0.999993
        )
        table.accessor.dense_sgd_param.adam.ada_decay_rate = strategy.get(
            'dense_ada_decay', 0.9999
        )
        table.accessor.dense_sgd_param.adam.ada_epsilon = strategy.get(
            'dense_ada_epsilon', 1e-8
        )
        table.accessor.dense_sgd_param.adam.mom_decay_rate = strategy.get(
            'dense_mom_decay', 0.99
        )
        table.accessor.dense_sgd_param.naive.learning_rate = strategy.get(
            'dense_naive_lr', 0.0002
        )
        table.accessor.fea_dim = fea_dim

    def add_data_norm_table(
        self,
        table_id,
        learning_rate,
        param_var,
        grad_var,
        strategy,
        sparse_table_names,
    ):
        """
        Args:
            table_id(int): id of datanorm table
            learning_rate(float): the learning rate used to update parameters
            param_var(list): param vars
            grad_var(list): param grad vars
            strategy(dict): the datanorm config dict
            sparse_table_names(list): sparse table names
        Returns:
            return None
        """
        fea_dim = 0
        dense_param_vars = []
        for p in param_var:
            if p.name not in sparse_table_names:
                dense_param_vars.append(p)

        for param in dense_param_vars:
            fea_dim += reduce(lambda x, y: x * y, param.shape, 1)

        for table in self._server.downpour_server_param.downpour_table_param:
            if table.table_id == table_id:
                if table.type == pslib.PS_DENSE_TABLE:
                    table.accessor.fea_dim = fea_dim
                    return
                else:
                    raise ValueError(
                        "expect table %s type=%s, but actual type=%s"
                        % (table_id, pslib.PS_DENSE_TABLE, table.type)
                    )
        if strategy is None:
            strategy = dict()

        support_datanorm_key_list = [
            'datanorm_table_class',
            'datanorm_compress_in_save',
            'datanorm_accessor_class',
            'datanorm_operation',
            'datanorm_decay_rate',
        ]

        for key in strategy:
            if key not in support_datanorm_key_list:
                raise ValueError("strategy key '%s' not support" % (key))

        table = self._server.downpour_server_param.downpour_table_param.add()
        table.table_id = table_id
        table.table_class = strategy.get(
            'datanorm_table_class', 'DownpourDenseTable'
        )
        table.type = pslib.PS_DENSE_TABLE
        table.compress_in_save = strategy.get('datanorm_compress_in_save', True)
        table.accessor.accessor_class = strategy.get(
            'datanorm_accessor_class', 'DownpourDenseValueAccessor'
        )
        table.accessor.dense_sgd_param.name = strategy.get(
            'datanorm_operation', 'summary'
        )
        table.accessor.dense_sgd_param.summary.summary_decay_rate = (
            strategy.get('datanorm_decay_rate', 0.999999)
        )
        table.accessor.fea_dim = fea_dim

    def add_sparse_optimizer(self, sgd, strategy, prefix):
        optimizer_name = strategy.get(prefix + "sparse_optimizer", "adagrad")
        sgd.name = optimizer_name
        if optimizer_name == "naive":
            sgd.naive.learning_rate = strategy.get(
                prefix + 'sparse_learning_rate', 0.05
            )
            sgd.naive.initial_range = strategy.get(
                prefix + 'sparse_initial_range', 1e-4
            )
            bounds = strategy.get(prefix + 'sparse_weight_bounds', [-10, 10])
            sgd.naive.weight_bounds.extend(bounds)
        elif optimizer_name == "adagrad":
            sgd.adagrad.learning_rate = strategy.get(
                prefix + 'sparse_learning_rate', 0.05
            )
            sgd.adagrad.initial_range = strategy.get(
                prefix + 'sparse_initial_range', 1e-4
            )
            if prefix == "embed_":
                sgd.adagrad.initial_range = 0
            sgd.adagrad.initial_g2sum = strategy.get(
                prefix + 'sparse_initial_g2sum', 3
            )
            bounds = strategy.get(prefix + 'sparse_weight_bounds', [-10, 10])
            sgd.adagrad.weight_bounds.extend(bounds)
        elif optimizer_name == "std_adagrad":
            sgd.adagrad.learning_rate = strategy.get(
                prefix + 'sparse_learning_rate', 0.05
            )
            sgd.adagrad.initial_range = strategy.get(
                prefix + 'sparse_initial_range', 1e-4
            )
            if prefix == "embed_":
                sgd.adagrad.initial_range = 0
            sgd.adagrad.initial_g2sum = strategy.get(
                prefix + 'sparse_initial_g2sum', 3
            )
            bounds = strategy.get(prefix + 'sparse_weight_bounds', [-10, 10])
            sgd.adagrad.weight_bounds.extend(bounds)
        elif optimizer_name == "adam":
            sgd.adam.learning_rate = strategy.get(
                prefix + 'sparse_learning_rate', 0.001
            )
            sgd.adam.initial_range = strategy.get(
                prefix + 'sparse_initial_range', 1e-4
            )
            sgd.adam.beta1_decay_rate = strategy.get(
                prefix + 'sparse_beta1_decay_rate', 0.9
            )
            sgd.adam.beta2_decay_rate = strategy.get(
                prefix + 'sparse_beta2_decay_rate', 0.999
            )
            sgd.adam.ada_epsilon = strategy.get(
                prefix + 'sparse_ada_epsilon', 1e-8
            )
            bounds = strategy.get(prefix + 'sparse_weight_bounds', [-10, 10])
            sgd.adam.weight_bounds.extend(bounds)

    def add_sparse_table_common_config(self, table, strategy):
        table.accessor.embedx_dim = strategy.get('sparse_embedx_dim', 8)
        table.accessor.embedx_threshold = strategy.get(
            'sparse_embedx_threshold', 10
        )
        table.accessor.fea_dim = int(table.accessor.embedx_dim) + 3
        table.accessor.downpour_accessor_param.nonclk_coeff = strategy.get(
            'sparse_nonclk_coeff', 0.1
        )
        table.accessor.downpour_accessor_param.click_coeff = strategy.get(
            'sparse_click_coeff', 1
        )
        table.accessor.downpour_accessor_param.base_threshold = strategy.get(
            'sparse_base_threshold', 1.5
        )
        table.accessor.downpour_accessor_param.delta_threshold = strategy.get(
            'sparse_delta_threshold', 0.25
        )
        table.accessor.downpour_accessor_param.delta_keep_days = strategy.get(
            'sparse_delta_keep_days', 16
        )
        table.accessor.downpour_accessor_param.delete_after_unseen_days = (
            strategy.get('sparse_delete_after_unseen_days', 30)
        )
        table.accessor.downpour_accessor_param.show_click_decay_rate = (
            strategy.get('sparse_show_click_decay_rate', 0.98)
        )
        table.accessor.downpour_accessor_param.delete_threshold = strategy.get(
            'sparse_delete_threshold', 0.8
        )
        converter = strategy.get(
            'sparse_converter',
            "(scripts/xbox_compressor_mf.py | bin/xbox_pb_converter)",
        )
        deconverter = strategy.get(
            'sparse_deconverter',
            "(bin/xbox_pb_deconverter | scripts/xbox_decompressor_mf.awk)",
        )

        table1 = table.accessor.table_accessor_save_param.add()
        table1.param = 1
        table1.converter = converter
        table1.deconverter = deconverter

        table2 = table.accessor.table_accessor_save_param.add()
        table2.param = 2
        table2.converter = converter
        table2.deconverter = deconverter

    def get_desc(self):
        """
        Return downpour server program_desc
        """
        return self._server


class DownpourWorker(Worker):
    """
    DownpourWorker class is used to generate worker program_desc
    Args:
        window (int): push params frequency
        worker: it is pslib.DownpourTrainerParameter
    Examples:
        worker = DownpourWorker(1)
    """

    def __init__(self, window):
        self.window = window
        self._worker = pslib.DownpourTrainerParameter()

    def add_sparse_table(
        self, table_id, slot_key_vars, slot_value_vars, slot_value_grads=None
    ):
        """
        Args:
            table_id(int): id of sparse params table
            slot_key_vars(list): slot key id
            slot_value_vars(list): slot key value after embedding
            slot_value_grads(list): grad of all params, default is None
        Returns:
            return None
        """
        if slot_value_grads is None:
            slot_value_grad_names = [
                var.name + "@GRAD" for var in slot_value_vars
            ]
        else:
            value_to_key = {}
            for i in range(len(slot_key_vars)):
                value_to_key[slot_value_vars[i].name] = slot_key_vars[i]
            slot_value_grad_names = []
            all_grad_names = [var.name for var in slot_value_grads]
            for var in slot_value_vars:
                if var.name + "@GRAD" in all_grad_names:
                    slot_value_grad_names.append(var.name + "@GRAD")
            sorted_slot_value_vars = [
                i
                for i in slot_value_vars
                if i.name + "@GRAD" in slot_value_grad_names
            ]
            sorted_slot_value_vars += [
                i
                for i in slot_value_vars
                if i.name + "@GRAD" not in slot_value_grad_names
            ]
            sorted_slot_key_vars = [
                value_to_key[v.name] for v in sorted_slot_value_vars
            ]

        target_table = None
        for table in self._worker.sparse_table:
            if table.table_id == table_id:
                keys = table.slot_key
                key_names = [var.name for var in sorted_slot_key_vars]
                for key_name in key_names:
                    if key_name not in keys:
                        raise ValueError(
                            "sparse table %s slot_key error" % table_id
                        )
                target_table = table
                break

        table = target_table
        if table is not None:
            self._worker.sparse_table.remove(table)
        table = self._worker.sparse_table.add()
        table.table_id = table_id
        table.slot_key.extend([var.name for var in sorted_slot_key_vars])
        table.slot_value.extend([var.name for var in sorted_slot_value_vars])
        table.slot_gradient.extend(slot_value_grad_names)

    def add_dense_table(
        self,
        table_id,
        learning_rate,
        param_vars,
        grad_vars,
        dense_start_table_id,
        sparse_table_names,
    ):
        r"""
        Args:
            table_id(int): id of sparse params table
            learning_rate(float): the learning rate used to update parameters. \
                Can be a float value
            param_vars(list): all dense param. it is a list.
            grad_vars(list): all dense grad parm it is a list.
            dense_start_table_id(int): dense table start index
            sparse_table_names(list): sparse table names
        Returns:
            return None
        """
        sparse_table_name_grad = []
        for name in sparse_table_names:
            sparse_table_name_grad.append(name + "@GRAD")

        dense_param_name = []
        for p in param_vars:
            if p.name not in sparse_table_names:
                dense_param_name.append(p.name)

        dense_grad_name = []
        for g in grad_vars:
            if g.name not in sparse_table_name_grad:
                dense_grad_name.append(g.name)

        dense_param_name.sort()
        dense_grad_name.sort()

        for table in self._worker.dense_table:
            if table.table_id == table_id:
                desc_dense_param_name = list(table.dense_variable_name)
                desc_dense_param_name.sort()

                if dense_param_name == desc_dense_param_name:
                    desc_dense_grad_name = list(
                        table.dense_gradient_variable_name
                    )
                    desc_dense_grad_name.sort()
                    if dense_grad_name == desc_dense_grad_name:
                        return
                    else:
                        raise ValueError(
                            "dense table %s dense_gradient_variable_name "
                            "error" % table_id
                        )
                else:
                    raise ValueError(
                        "dense table %s dense_variable_name error" % table_id
                    )

        table = self._worker.dense_table.add()
        table.table_id = table_id

        # def cmp_fc(x, y):
        #    if x.startswith("fc_") and y.startswith("fc_"):
        #        index_x = x.find('.')
        #        index_y = y.find('.')
        #        if index_x > 0 and index_y > 0:
        #            num_x = x[3:index_x]
        #            num_y = y[3:index_y]
        #            if num_x.isdigit() and num_y.isdigit():
        #                if int(num_x) < int(num_y):
        #                    return -1
        #                if int(num_x) > int(num_y):
        #                    return 1
        #                if x[index_x + 1] == 'w' and y[index_y + 1] == 'b':
        #                    return -1
        #                if x[index_x + 1] == 'b' and y[index_y + 1] == 'w':
        #                    return 1
        #    if x < y:
        #        return -1
        #    else:
        #        return 1

        # table.dense_variable_name.extend(sorted(dense_param_name, cmp_fc))
        # table.dense_gradient_variable_name.extend(
        #    sorted(dense_grad_name, cmp_fc))
        table.dense_variable_name.extend(dense_param_name)
        table.dense_gradient_variable_name.extend(dense_grad_name)

    def get_desc(self):
        """
        Return downpour worker program_desc
        """
        return self._worker