#   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 copy

from .ptq_quantizer import (
    SUPPORT_ACT_QUANTIZERS,
    SUPPORT_WT_QUANTIZERS,
    KLQuantizer,
    PerChannelAbsmaxQuantizer,
)


class PTQConfig:
    """
    The PTQ config shows how to quantize the inputs and outputs.
    """

    def __init__(self, activation_quantizer, weight_quantizer):
        """
        Constructor.

        Args:
            activation_quantizer(BaseQuantizer): The activation quantizer.
                It should be the instance of BaseQuantizer.
            weight_quantizer(BaseQuantizer): The weight quantizer.
                It should be the instance of BaseQuantizer.
        """
        super().__init__()
        assert isinstance(activation_quantizer, tuple(SUPPORT_ACT_QUANTIZERS))
        assert isinstance(weight_quantizer, tuple(SUPPORT_WT_QUANTIZERS))

        self.in_act_quantizer = copy.deepcopy(activation_quantizer)
        self.out_act_quantizer = copy.deepcopy(activation_quantizer)
        self.wt_quantizer = copy.deepcopy(weight_quantizer)

        self.quant_hook_handle = None

        # In order to wrap simulated layers, use in_act_quantizer
        # to calculate the input thresholds for conv2d, linear and etc.
        self.enable_in_act_quantizer = False


default_ptq_config = PTQConfig(KLQuantizer(), PerChannelAbsmaxQuantizer())