# 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 RMSprop(Optimizer1State):
    def __init__(
        self,
        params,
        lr=1e-2,
        alpha=0.99,
        eps=1e-8,
        weight_decay=0,
        momentum=0,
        centered=False,
        optim_bits=32,
        args=None,
        min_8bit_size=4096,
        percentile_clipping=100,
        block_wise=True,
    ):
        if alpha == 0:
            raise NotImplementedError(f"RMSprop with alpha==0.0 is not supported!")
        if centered:
            raise NotImplementedError(f"Centered RMSprop is not supported!")
        super(RMSprop, self).__init__(
            "rmsprop",
            params,
            lr,
            (alpha, momentum),
            eps,
            weight_decay,
            optim_bits,
            args,
            min_8bit_size,
            percentile_clipping,
            block_wise,
        )


class RMSprop8bit(Optimizer1State):
    def __init__(
        self,
        params,
        lr=1e-2,
        alpha=0.99,
        eps=1e-8,
        weight_decay=0,
        momentum=0,
        centered=False,
        args=None,
        min_8bit_size=4096,
        percentile_clipping=100,
        block_wise=True,
    ):
        if alpha == 0:
            raise NotImplementedError(f"RMSprop with alpha==0.0 is not supported!")
        if centered:
            raise NotImplementedError(f"Centered RMSprop is not supported!")
        super(RMSprop8bit, self).__init__(
            "rmsprop",
            params,
            lr,
            (alpha, momentum),
            eps,
            weight_decay,
            8,
            args,
            min_8bit_size,
            percentile_clipping,
            block_wise,
        )


class RMSprop32bit(Optimizer1State):
    def __init__(
        self,
        params,
        lr=1e-2,
        alpha=0.99,
        eps=1e-8,
        weight_decay=0,
        momentum=0,
        centered=False,
        args=None,
        min_8bit_size=4096,
        percentile_clipping=100,
        block_wise=True,
    ):

        if alpha == 0:
            raise NotImplementedError(f"RMSprop with alpha==0.0 is not supported!")
        if centered:
            raise NotImplementedError(f"Centered RMSprop is not supported!")
        super(RMSprop32bit, self).__init__(
            "rmsprop",
            params,
            lr,
            (alpha, momentum),
            eps,
            weight_decay,
            32,
            args,
            min_8bit_size,
            percentile_clipping,
            block_wise,
        )