# Copyright (c) Facebook, Inc. and its affiliates.
#
# This source code is licensed under the MIT license found in the
# LICENSE file in the root directory of this source tree.
from bitsandbytes.optim.optimizer import Optimizer1State


class Adagrad(Optimizer1State):
    def __init__(
        self,
        params,
        lr=1e-2,
        lr_decay=0,
        weight_decay=0,
        initial_accumulator_value=0,
        eps=1e-10,
        optim_bits=32,
        args=None,
        min_8bit_size=4096,
        percentile_clipping=100,
        block_wise=True,
    ):
        if not 0.0 <= lr:
            raise ValueError("Invalid learning rate: {}".format(lr))
        if not 0.0 <= weight_decay:
            raise ValueError("Invalid weight_decay value: {}".format(weight_decay))
        if not 0.0 <= eps:
            raise ValueError("Invalid epsilon value: {}".format(eps))
        if initial_accumulator_value != 0.0:
            raise ValueError("Initial accumulator value != 0.0 not supported!")
        if lr_decay != 0.0:
            raise ValueError("Lr Decay != 0.0 not supported!")
        super(Adagrad, self).__init__(
            "adagrad",
            params,
            lr,
            (0.0, 0.0),
            eps,
            weight_decay,
            optim_bits,
            args,
            min_8bit_size,
            percentile_clipping,
            block_wise,
        )


class Adagrad8bit(Optimizer1State):
    def __init__(
        self,
        params,
        lr=1e-2,
        lr_decay=0,
        weight_decay=0,
        initial_accumulator_value=0,
        eps=1e-10,
        optim_bits=8,
        args=None,
        min_8bit_size=4096,
        percentile_clipping=100,
        block_wise=True,
    ):
        if not 0.0 <= lr:
            raise ValueError("Invalid learning rate: {}".format(lr))
        if not 0.0 <= weight_decay:
            raise ValueError("Invalid weight_decay value: {}".format(weight_decay))
        if not 0.0 <= eps:
            raise ValueError("Invalid epsilon value: {}".format(eps))
        if initial_accumulator_value != 0.0:
            raise ValueError("Initial accumulator value != 0.0 not supported!")
        if lr_decay != 0.0:
            raise ValueError("Lr Decay != 0.0 not supported!")
        assert block_wise
        super(Adagrad8bit, self).__init__(
            "adagrad",
            params,
            lr,
            (0.0, 0.0),
            eps,
            weight_decay,
            8,
            args,
            min_8bit_size,
            percentile_clipping,
            block_wise,
        )


class Adagrad32bit(Optimizer1State):
    def __init__(
        self,
        params,
        lr=1e-2,
        lr_decay=0,
        weight_decay=0,
        initial_accumulator_value=0,
        eps=1e-10,
        optim_bits=32,
        args=None,
        min_8bit_size=4096,
        percentile_clipping=100,
        block_wise=True,
    ):
        if not 0.0 <= lr:
            raise ValueError("Invalid learning rate: {}".format(lr))
        if not 0.0 <= weight_decay:
            raise ValueError("Invalid weight_decay value: {}".format(weight_decay))
        if not 0.0 <= eps:
            raise ValueError("Invalid epsilon value: {}".format(eps))
        if initial_accumulator_value != 0.0:
            raise ValueError("Initial accumulator value != 0.0 not supported!")
        if lr_decay != 0.0:
            raise ValueError("Lr Decay != 0.0 not supported!")
        super(Adagrad32bit, self).__init__(
            "adagrad",
            params,
            lr,
            (0.0, 0.0),
            eps,
            weight_decay,
            32,
            args,
            min_8bit_size,
            percentile_clipping,
            block_wise,
        )