FateWithShellmiaoComment/Fate/python/fate_client/pipeline/param/hetero_sshe_linr_param.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-

#
#  Copyright 2019 The FATE Authors. All Rights Reserved.
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#  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
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#      http://www.apache.org/licenses/LICENSE-2.0
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#  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 pipeline.param.glm_param import LinearModelParam
from pipeline.param.callback_param import CallbackParam
from pipeline.param.encrypt_param import EncryptParam
from pipeline.param.encrypted_mode_calculation_param import EncryptedModeCalculatorParam
from pipeline.param.cross_validation_param import CrossValidationParam
from pipeline.param.init_model_param import InitParam
from pipeline.param import consts


class HeteroSSHELinRParam(LinearModelParam):
    """
    Parameters used for Hetero SSHE Linear Regression.

    Parameters
    ----------
    penalty : {'L2' or 'L1'}
        Penalty method used in LinR. Please note that, when using encrypted version in HeteroLinR,
        'L1' is not supported.

    tol : float, default: 1e-4
        The tolerance of convergence

    alpha : float, default: 1.0
        Regularization strength coefficient.

    optimizer : {'sgd', 'rmsprop', 'adam', 'adagrad', 'nesterov_momentum_sgd'}
        Optimize method

    batch_size : int, default: -1
        Batch size when updating model. -1 means use all data in a batch. i.e. Not to use mini-batch strategy.

    learning_rate : float, default: 0.01
        Learning rate

    max_iter : int, default: 20
        The maximum iteration for training.

    init_param: InitParam object, default: default InitParam object
        Init param method object.

    early_stop : {'diff', 'abs', 'weight_dff'}
        Method used to judge convergence.
            a)	diff： Use difference of loss between two iterations to judge whether converge.
            b)	abs: Use the absolute value of loss to judge whether converge. i.e. if loss < tol, it is converged.
            c)  weight_diff: Use difference between weights of two consecutive iterations

    encrypt_param: EncryptParam object, default: default EncryptParam object
        encrypt param

    encrypted_mode_calculator_param: EncryptedModeCalculatorParam object, default: default EncryptedModeCalculatorParam object
        encrypted mode calculator param

    cv_param: CrossValidationParam object, default: default CrossValidationParam object
        cv param

    decay: int or float, default: 1
        Decay rate for learning rate. learning rate will follow the following decay schedule.
        lr = lr0/(1+decay*t) if decay_sqrt is False. If decay_sqrt is True, lr = lr0 / sqrt(1+decay*t)
        where t is the iter number.

    decay_sqrt: Bool, default: True
        lr = lr0/(1+decay*t) if decay_sqrt is False, otherwise, lr = lr0 / sqrt(1+decay*t)

    callback_param: CallbackParam object
        callback param

    reveal_strategy: str, "respectively", "encrypted_reveal_in_host", default: "respectively"
        "respectively": Means guest and host can reveal their own part of weights only.
        "encrypted_reveal_in_host": Means host can be revealed his weights in encrypted mode, and guest can be revealed in normal mode.

    reveal_every_iter: bool, default: False
        Whether reconstruct model weights every iteration. If so, Regularization is available.
        The performance will be better as well since the algorithm process is simplified.


    """

    def __init__(self, penalty='L2',
                 tol=1e-4, alpha=1.0, optimizer='sgd',
                 batch_size=-1, learning_rate=0.01, init_param=InitParam(),
                 max_iter=20, early_stop='diff',
                 encrypt_param=EncryptParam(),
                 encrypted_mode_calculator_param=EncryptedModeCalculatorParam(),
                 cv_param=CrossValidationParam(), decay=1, decay_sqrt=True,
                 callback_param=CallbackParam(),
                 use_mix_rand=True,
                 reveal_strategy="respectively",
                 reveal_every_iter=False
                 ):
        super(HeteroSSHELinRParam, self).__init__(penalty=penalty, tol=tol, alpha=alpha, optimizer=optimizer,
                                                  batch_size=batch_size, learning_rate=learning_rate,
                                                  init_param=init_param, max_iter=max_iter, early_stop=early_stop,
                                                  encrypt_param=encrypt_param, cv_param=cv_param, decay=decay,
                                                  decay_sqrt=decay_sqrt,
                                                  callback_param=callback_param)
        self.encrypted_mode_calculator_param = copy.deepcopy(encrypted_mode_calculator_param)
        self.use_mix_rand = use_mix_rand
        self.reveal_strategy = reveal_strategy
        self.reveal_every_iter = reveal_every_iter

    def check(self):
        descr = "sshe linear_regression_param's "
        super(HeteroSSHELinRParam, self).check()
        if self.encrypt_param.method != consts.PAILLIER:
            raise ValueError(
                descr + "encrypt method supports 'Paillier' only")

        self.check_boolean(self.reveal_every_iter, descr)
        if self.penalty is None:
            pass
        elif type(self.penalty).__name__ != "str":
            raise ValueError(
                f"{descr} penalty {self.penalty} not supported, should be str type")
        else:
            self.penalty = self.penalty.upper()
            """
            if self.penalty not in [consts.L1_PENALTY, consts.L2_PENALTY]:
                raise ValueError(
                    f"{descr} penalty not supported, penalty should be 'L1', 'L2' or 'none'")
            """
            if not self.reveal_every_iter:
                if self.penalty not in [consts.L2_PENALTY, consts.NONE.upper()]:
                    raise ValueError(
                        f"penalty should be 'L2' or 'none', when reveal_every_iter is False"
                    )

        if type(self.optimizer).__name__ != "str":
            raise ValueError(
                f"{descr} optimizer {self.optimizer} not supported, should be str type")
        else:
            self.optimizer = self.optimizer.lower()
            if self.reveal_every_iter:
                if self.optimizer not in ['sgd', 'rmsprop', 'adam', 'adagrad']:
                    raise ValueError(
                        "When reveal_every_iter is True, "
                        f"{descr} optimizer not supported, optimizer should be"
                        " 'sgd', 'rmsprop', 'adam', or 'adagrad'")
            else:
                if self.optimizer not in ['sgd']:
                    raise ValueError("When reveal_every_iter is False, "
                                     f"{descr} optimizer not supported, optimizer should be"
                                     " 'sgd'")
        if self.callback_param.validation_freqs is not None:
            if self.reveal_every_iter is False:
                raise ValueError(f"When reveal_every_iter is False, validation every iter"
                                 f" is not supported.")

        self.reveal_strategy = self.check_and_change_lower(self.reveal_strategy,
                                                           ["respectively", "encrypted_reveal_in_host"],
                                                           f"{descr} reveal_strategy")

        if self.reveal_strategy == "encrypted_reveal_in_host" and self.reveal_every_iter:
            raise PermissionError("reveal strategy: encrypted_reveal_in_host mode is not allow to reveal every iter.")
        return True