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import os
import time
from typing import Any, Mapping, Text, Tuple, Union, NamedTuple
from functools import partial
import re
import dataclasses
import random
from ml_collections.config_dict import config_dict
from ml_collections import ConfigDict
import jax
import jax.numpy as jnp
import numpy as np
from absl import logging
import optax
from EasyLM.jax_utils import float_to_dtype
class OptimizerFactory(object):
""" Configurable optax optimizer factory. """
def __init__(self):
raise NotImplementedError
@staticmethod
def get_default_config(updates=None):
config = ConfigDict()
config.accumulate_gradient_steps = 1
config.type = 'adamw'
config.palm_optimizer = PalmOptimizerFactory.get_default_config()
config.adamw_optimizer = AdamWOptimizerFactory.get_default_config()
config.lion_optimizer = LionOptimizerFactory.get_default_config()
if updates is not None:
config.update(ConfigDict(updates).copy_and_resolve_references())
return config
@classmethod
def get_optimizer(cls, config, weight_decay_mask=None):
config = cls.get_default_config(config)
if config.type == 'palm':
optimizer, optimizer_info = PalmOptimizerFactory.get_optimizer(
config.palm_optimizer, weight_decay_mask
)
elif config.type == 'adamw':
optimizer, optimizer_info = AdamWOptimizerFactory.get_optimizer(
config.adamw_optimizer, weight_decay_mask
)
elif config.type == 'lion':
optimizer, optimizer_info = LionOptimizerFactory.get_optimizer(
config.lion_optimizer, weight_decay_mask
)
else:
raise ValueError(f'Unknown optimizer type: {config.type}')
if config.accumulate_gradient_steps > 1:
optimizer = optax.MultiSteps(
optimizer, config.accumulate_gradient_steps
)
return optimizer, optimizer_info
class PalmOptimizerFactory(object):
""" PaLM optimizer factory. This optimizer implements the optimizer
described in the PaLM paper: https://arxiv.org/abs/2204.02311
"""
def __init__(self):
raise NotImplementedError
@staticmethod
def get_default_config(updates=None):
config = ConfigDict()
config.lr = 0.01
config.lr_warmup_steps = 10000
config.b1 = 0.9
config.b2 = 0.99
config.clip_gradient = 1.0
config.weight_decay = 1e-4
config.bf16_momentum = False
if updates is not None:
config.update(ConfigDict(updates).copy_and_resolve_references())
return config
@classmethod
def get_optimizer(cls, config, weight_decay_mask=None):
config = cls.get_default_config(config)
def learning_rate_schedule(step):
multiplier = config.lr / 0.01
return multiplier / jnp.sqrt(jnp.maximum(step, config.lr_warmup_steps))
def weight_decay_schedule(step):
multiplier = config.weight_decay / 1e-4
return -multiplier * jnp.square(learning_rate_schedule(step))
optimizer_info = dict(
learning_rate_schedule=learning_rate_schedule,
weight_decay_schedule=weight_decay_schedule,
)
optimizer = optax.chain(
optax.clip_by_global_norm(config.clip_gradient),
optax.adafactor(
learning_rate=learning_rate_schedule,
multiply_by_parameter_scale=True,
momentum=config.b1,
decay_rate=config.b2,
factored=False,
clipping_threshold=None,
dtype_momentum=jnp.bfloat16 if config.bf16_momentum else jnp.float32,
),
optax_add_scheduled_weight_decay(
weight_decay_schedule, weight_decay_mask
)
)
return optimizer, optimizer_info
class AdamWOptimizerFactory(object):
""" AdamW optimizer with cosine schedule. """
def __init__(self):
raise NotImplementedError
@staticmethod
def get_default_config(updates=None):
config = ConfigDict()
config.init_lr = 0.0
config.end_lr = 0.001
config.lr = 0.01
config.lr_warmup_steps = 2000
config.lr_decay_steps = 500000
config.b1 = 0.9
config.b2 = 0.95
config.clip_gradient = 1.0
config.weight_decay = 1e-4
config.bf16_momentum = False
config.multiply_by_parameter_scale = False
if updates is not None:
config.update(ConfigDict(updates).copy_and_resolve_references())
return config
@classmethod
def get_optimizer(cls, config, weight_decay_mask=None):
config = cls.get_default_config(config)
learning_rate_schedule = optax.warmup_cosine_decay_schedule(
init_value=config.init_lr,
peak_value=config.lr,
warmup_steps=config.lr_warmup_steps,
decay_steps=config.lr_decay_steps,
end_value=config.end_lr,
)
optimizer_info = dict(
learning_rate_schedule=learning_rate_schedule,
)
if config.multiply_by_parameter_scale:
optimizer = optax.chain(
optax.clip_by_global_norm(config.clip_gradient),
optax.adafactor(
learning_rate=learning_rate_schedule,
multiply_by_parameter_scale=True,
momentum=config.b1,
decay_rate=config.b2,
factored=False,
clipping_threshold=None,
dtype_momentum=jnp.bfloat16 if config.bf16_momentum else jnp.float32,
),
optax_add_scheduled_weight_decay(
lambda step: -learning_rate_schedule(step) * config.weight_decay,
weight_decay_mask
)
)
else:
optimizer = optax.chain(
optax.clip_by_global_norm(config.clip_gradient),
optax.adamw(
learning_rate=learning_rate_schedule,
weight_decay=config.weight_decay,
b1=config.b1,
b2=config.b2,
mask=weight_decay_mask,
mu_dtype=jnp.bfloat16 if config.bf16_momentum else jnp.float32,
),
)
return optimizer, optimizer_info
class LionOptimizerFactory(object):
""" Lion optimizer with cosine schedule. """
def __init__(self):
raise NotImplementedError
@staticmethod
def get_default_config(updates=None):
config = ConfigDict()
config.init_lr = 0.0
config.end_lr = 0.0001
config.lr = 0.001
config.lr_warmup_steps = 2000
config.lr_decay_steps = 500000
config.b1 = 0.9
config.b2 = 0.98
config.clip_gradient = 1.0
config.weight_decay = 1e-3
config.bf16_momentum = False
if updates is not None:
config.update(ConfigDict(updates).copy_and_resolve_references())
return config
@classmethod
def get_optimizer(cls, config, weight_decay_mask=None):
config = cls.get_default_config(config)
learning_rate_schedule = optax.warmup_cosine_decay_schedule(
init_value=config.init_lr,
peak_value=config.lr,
warmup_steps=config.lr_warmup_steps,
decay_steps=config.lr_decay_steps,
end_value=config.end_lr,
)
optimizer_info = dict(
learning_rate_schedule=learning_rate_schedule,
)
optimizer = optax.chain(
optax.clip_by_global_norm(config.clip_gradient),
optax.lion(
learning_rate=learning_rate_schedule,
weight_decay=config.weight_decay,
b1=config.b1,
b2=config.b2,
mask=weight_decay_mask,
mu_dtype=jnp.bfloat16 if config.bf16_momentum else jnp.float32,
),
)
return optimizer, optimizer_info
class OptaxScheduledWeightDecayState(NamedTuple):
count: jax.Array
def optax_add_scheduled_weight_decay(schedule_fn, mask=None):
""" Apply weight decay with schedule. """
def init_fn(params):
del params
return OptaxScheduledWeightDecayState(count=jnp.zeros([], jnp.int32))
def update_fn(updates, state, params):
if params is None:
raise ValueError('Params cannot be None for weight decay!')
weight_decay = schedule_fn(state.count)
updates = jax.tree_util.tree_map(
lambda g, p: g + weight_decay * p, updates, params
)
return updates, OptaxScheduledWeightDecayState(
count=optax.safe_int32_increment(state.count)
)
if mask is not None:
return optax.masked(optax.GradientTransformation(init_fn, update_fn), mask)
return optax.GradientTransformation(init_fn, update_fn)
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