lion.py

# 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 Lion(Optimizer1State):
    def __init__(
        self,
        params,
        lr=1e-4,
        betas=(0.9, 0.99),
        weight_decay=0,
        optim_bits=32,
        args=None,
        min_8bit_size=4096,
        percentile_clipping=100,
        block_wise=True,
    ):
        beta1, beta2 = betas
        super().__init__(
            "lion",
            params,
            lr,
            (beta1, 0.),
            beta2,
            weight_decay,
            optim_bits,
            args,
            min_8bit_size,
            percentile_clipping,
            block_wise,
        )


class Lion8bit(Optimizer1State):
    def __init__(
        self,
        params,
        lr=1e-4,
        betas=(0.9, 0.99),
        weight_decay=0,
        args=None,
        min_8bit_size=4096,
        percentile_clipping=100,
        block_wise=True,
    ):
        beta1, beta2 = betas
        super().__init__(
            "lion",
            params,
            lr,
            (beta1, 0.),
            beta2,
            weight_decay,
            8,
            args,
            min_8bit_size,
            percentile_clipping,
            block_wise,
        )


class Lion32bit(Optimizer1State):
    def __init__(
        self,
        params,
        lr=1e-4,
        betas=(0.9, 0.99),
        weight_decay=0,
        args=None,
        min_8bit_size=4096,
        percentile_clipping=100,
        block_wise=True,
    ):
        beta1, beta2 = betas
        super().__init__(
            "lion",
            params,
            lr,
            (beta1, 0.),
            beta2,
            weight_decay,
            32,
            args,
            min_8bit_size,
            percentile_clipping,
            block_wise,
        )