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adamw.py
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adamw.py
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import torch
import math
from torch import Tensor
from typing import List, Optional
import time
from .optimizer import LowBitOptimizer
from ..functional import vectorwise_dequant, vectorwise_quant
__all__ = ["AdamW"]
class AdamW(LowBitOptimizer):
def __init__(
self,
params,
lr=1e-3,
betas=(0.9, 0.999),
eps=1e-8,
weight_decay=1e-2,
use_first_moment=True,
factor_second_moment=False,
qconfig=None,
*,
fused: Optional[bool] = False,
):
if not 0.0 <= lr:
raise ValueError("Invalid learning rate: {}".format(lr))
if not 0.0 <= eps:
raise ValueError("Invalid epsilon value: {}".format(eps))
if not 0.0 <= betas[0] < 1.0:
raise ValueError("Invalid beta parameter at index 0: {}".format(betas[0]))
if not 0.0 <= betas[1] < 1.0:
raise ValueError("Invalid beta parameter at index 1: {}".format(betas[1]))
if not 0.0 <= weight_decay:
raise ValueError("Invalid weight_decay value: {}".format(weight_decay))
defaults = dict(
lr=lr,
betas=betas,
eps=eps,
weight_decay=weight_decay,
fused=fused,
use_first_moment=use_first_moment,
factor_second_moment=factor_second_moment,
)
super().__init__(params, defaults, qconfig)
def __setstate__(self, state):
super().__setstate__(state)
for group in self.param_groups:
group.setdefault("fused", None)
state_values = list(self.state.values())
step_is_tensor = (len(state_values) != 0) and torch.is_tensor(
state_values[0]["step"]
)
if not step_is_tensor:
for s in state_values:
s["step"] = torch.tensor(float(s["step"]))
def get_subqconfig(self, optimizer_state_name):
if optimizer_state_name == 'exp_avg':
return self.qconfig.QUANT.M
elif optimizer_state_name == 'exp_avg_sq':
return self.qconfig.QUANT.SQM
else:
raise ValueError(
f""
)
@staticmethod
def _get_options(param_group, param_shape):
factored = len(param_shape) >= 2 and param_group["factor_second_moment"]
use_first_moment = param_group["use_first_moment"]
return factored, use_first_moment
@staticmethod
def _approx_sq_grad(exp_avg_sq_row, exp_avg_sq_col):
# copy from fairseq's adafactor implementation:
# https://github.com/huggingface/transformers/blob/8395f14de6068012787d83989c3627c3df6a252b/src/transformers/optimization.py#L505
r_factor = (exp_avg_sq_row / exp_avg_sq_row.mean(dim=-1, keepdim=True)).unsqueeze(-1)
c_factor = exp_avg_sq_col.unsqueeze(-2)
return torch.mul(r_factor, c_factor)
def _init_group(
self,
group,
params_with_grad,
grads,
exp_avgs,
exp_avg_sqs,
exp_avg_sqs_factored,
exp_avg_sq_rows,
exp_avg_sq_cols,
state_steps,
exp_avgs_q_enabled,
exp_avg_sqs_q_enabled,
exp_avgs_q_overhead,
exp_avg_sqs_q_overhead,
exp_avgs_qmap,
exp_avg_sqs_qmap,
):
for p in group["params"]:
if p.grad is None:
continue
params_with_grad.append(p)
if p.grad.is_sparse:
raise RuntimeError("AdamW does not support sparse gradients")
# if p.grad.dtype in {torch.float16, torch.bfloat16}:
# p.grad = p.grad.float()
grads.append(p.grad)
state = self.state[p]
factored, _ = self._get_options(group, p.shape)
# State initialization
if len(state) == 0:
# note(crcrpar): Deliberately host `step` on CPU if both capturable and fused are off.
# This is because kernel launches are costly on CUDA and XLA.
state["step"] = torch.tensor(0.0)
# Exponential moving average of gradient values
state["exp_avg"] = torch.zeros((), dtype=torch.float, device=p.device)
self.init_qstate(p, "exp_avg")
# Exponential moving average of squared gradient values
if factored:
state["exp_avg_sq_row"] = torch.zeros(p.shape[:-1], device=p.device)
state["exp_avg_sq_col"] = torch.zeros(p.shape[:-2] + p.shape[-1:], device=p.device)
else:
state["exp_avg_sq"] = torch.zeros((), dtype=torch.float, device=p.device)
self.init_qstate(p, "exp_avg_sq")
state_steps.append(state["step"])
exp_avgs.append(state["exp_avg"])
exp_avg_sqs_factored.append(factored)
if factored:
exp_avg_sq_rows.append(state["exp_avg_sq_row"])
exp_avg_sq_cols.append(state["exp_avg_sq_col"])
exp_avg_sqs.append(None)
else:
exp_avg_sq_rows.append(None)
exp_avg_sq_cols.append(None)
exp_avg_sqs.append(state["exp_avg_sq"])
exp_avgs_q_enabled.append(self.override_q_enable[id(p)] if id(p) in self.override_q_enable else state["exp_avg_qstate"]["enable"])
exp_avg_sqs_q_enabled.append(self.override_q_enable[id(p)] if id(p) in self.override_q_enable else state["exp_avg_sq_qstate"]["enable"])
exp_avgs_q_overhead.append(state["exp_avg_qstate"]["overhead"])
exp_avg_sqs_q_overhead.append(state["exp_avg_sq_qstate"]["overhead"])
exp_avgs_qmap.append(state["exp_avg_qstate"]["qmap"])
exp_avg_sqs_qmap.append(state["exp_avg_sq_qstate"]["qmap"])
@torch.no_grad()
def step(self, closure=None):
"""Performs a single optimization step.
Args:
closure (Callable, optional): A closure that reevaluates the model
and returns the loss.
"""
loss = None
if closure is not None:
with torch.enable_grad():
loss = closure()
for group in self.param_groups:
params_with_grad = []
grads = []
exp_avg_sqs_factored = []
exp_avgs = []
exp_avg_sqs = []
exp_avg_sq_rows = []
exp_avg_sq_cols = []
state_steps = []
beta1, beta2 = group["betas"]
exp_avgs_q_enabled = []
exp_avg_sqs_q_enabled = []
exp_avgs_q_overhead = []
exp_avg_sqs_q_overhead = []
exp_avgs_qmap = []
exp_avg_sqs_qmap = []
self._init_group(
group,
params_with_grad,
grads,
exp_avgs,
exp_avg_sqs,
exp_avg_sqs_factored,
exp_avg_sq_rows,
exp_avg_sq_cols,
state_steps,
exp_avgs_q_enabled,
exp_avg_sqs_q_enabled,
exp_avgs_q_overhead,
exp_avg_sqs_q_overhead,
exp_avgs_qmap,
exp_avg_sqs_qmap,
)
kwargs = dict(
params_with_grad=params_with_grad,
grads=grads,
exp_avgs=exp_avgs,
exp_avg_sqs=exp_avg_sqs,
exp_avg_sqs_factored=exp_avg_sqs_factored,
exp_avg_sq_rows=exp_avg_sq_rows,
exp_avg_sq_cols=exp_avg_sq_cols,
state_steps=state_steps,
exp_avgs_q_enabled=exp_avgs_q_enabled,
exp_avg_sqs_q_enabled=exp_avg_sqs_q_enabled,
exp_avgs_q_overhead=exp_avgs_q_overhead,
exp_avg_sqs_q_overhead=exp_avg_sqs_q_overhead,
exp_avgs_qmap=exp_avgs_qmap,
exp_avg_sqs_qmap=exp_avg_sqs_qmap,
exp_avg_qmetadata=self.get_qmetadata_by_state_name("exp_avg"),
exp_avg_sq_qmetadata=self.get_qmetadata_by_state_name("exp_avg_sq"),
beta1=beta1,
beta2=beta2,
lr=group["lr"],
weight_decay=group["weight_decay"],
eps=group["eps"],
)
if group["fused"] and torch.jit.is_scripting():
raise RuntimeError("torch.jit.script not supported with fused optimizers")
if group["fused"] and not torch.jit.is_scripting():
_fused_adamw4bit(**kwargs)
else:
_single_tensor_adamw4bit(**kwargs)
# beta1, beta2 = group["betas"]
# lr = group["lr"]
# weight_decay = group["weight_decay"]
# eps = group["eps"]
# for p in group["params"]:
# if p.grad is None:
# continue
# grad = p.grad.data
# if grad.dtype in {torch.float16, torch.bfloat16}:
# grad = grad.float()
# if p.grad.is_sparse:
# raise RuntimeError("AdamW does not support sparse gradients")
# state = self.state[p]
# grad_shape = p.grad.shape
# factored, use_first_moment = self._get_options(group, grad_shape)
# # State initialization
# if len(state) == 0:
# # note(crcrpar): Deliberately host `step` on CPU if both capturable and fused are off.
# # This is because kernel launches are costly on CUDA and XLA.
# state["step"] = 0
# # Exponential moving average of gradient values
# if use_first_moment:
# state["exp_avg"] = torch.tensor(0.0)
# # Exponential moving average of squared gradient values
# if factored:
# state["exp_avg_sq_row"] = torch.zeros(grad_shape[:-1]).to(grad)
# state["exp_avg_sq_col"] = torch.zeros(grad_shape[:-2] + grad_shape[-1:]).to(grad)
# else:
# state["exp_avg_sq"] = torch.tensor(0.0)
# # quantization state
# self.init_qstate(p)
# # take out optimizer state
# param = p
# # dequantize
# if use_first_moment:
# exp_avg = state["exp_avg"]
# if exp_avg.numel() <= 1:
# exp_avg.data = torch.zeros_like(param, memory_format=torch.preserve_format)
# else:
# hat_exp_avg = self.dequantize(param, 'exp_avg', exp_avg)
# if hat_exp_avg is not None:
# exp_avg.data = hat_exp_avg
# del hat_exp_avg
# else:
# exp_avg = grad
# if factored:
# exp_avg_sq_row = state["exp_avg_sq_row"]
# exp_avg_sq_col = state["exp_avg_sq_col"]
# else:
# exp_avg_sq = state["exp_avg_sq"]
# if exp_avg_sq.numel() <= 1:
# exp_avg_sq.data = torch.zeros_like(param, memory_format=torch.preserve_format)
# else:
# hat_exp_avg_sq = self.dequantize(param, 'exp_avg_sq', exp_avg_sq)
# if hat_exp_avg_sq is not None:
# exp_avg_sq.data = hat_exp_avg_sq
# del hat_exp_avg_sq
# # update
# state["step"] += 1
# # Perform stepweight decay
# param.mul_(1 - lr * weight_decay)
# # Decay the first and second moment running average coefficient
# if use_first_moment:
# exp_avg.mul_(beta1).add_(grad, alpha=1 - beta1)
# if factored:
# update = (grad ** 2)
# exp_avg_sq_row.mul_(beta2).add_(update.mean(dim=-1), alpha=1 - beta2)
# exp_avg_sq_col.mul_(beta2).add_(update.mean(dim=-2), alpha=1 - beta2)
# exp_avg_sq = self._approx_sq_grad(exp_avg_sq_row, exp_avg_sq_col)
# else:
# exp_avg_sq.mul_(beta2).addcmul_(grad, grad, value=1 - beta2)
# step = state["step"]
# bias_correction1 = 1 - beta1 ** step
# bias_correction2 = 1 - beta2 ** step
# step_size = lr / bias_correction1
# bias_correction2_sqrt = _dispatch_sqrt(bias_correction2)
# denom = (exp_avg_sq.sqrt() / bias_correction2_sqrt).add_(eps)
# param.addcdiv_(exp_avg, denom, value=-step_size)
# # take in optimizer state
# if use_first_moment:
# q_exp_avg = self.quantize(param, 'exp_avg', exp_avg)
# if q_exp_avg is not None:
# exp_avg.data = q_exp_avg
# if not factored:
# q_exp_avg_sq = self.quantize(param, 'exp_avg_sq', exp_avg_sq)
# if q_exp_avg_sq is not None:
# exp_avg_sq.data = q_exp_avg_sq
return loss
def _single_tensor_adamw4bit(
params_with_grad: List[Tensor],
grads: List[Tensor],
exp_avgs: List[Tensor],
exp_avg_sqs: List[Tensor],
exp_avg_sqs_factored: List[bool],
exp_avg_sq_rows: List[Tensor],
exp_avg_sq_cols: List[Tensor],
state_steps: List[Tensor],
exp_avgs_q_enabled: List[bool],
exp_avg_sqs_q_enabled: List[bool],
exp_avgs_q_overhead: List,
exp_avg_sqs_q_overhead: List,
exp_avgs_qmap: List,
exp_avg_sqs_qmap: List,
exp_avg_qmetadata,
exp_avg_sq_qmetadata,
*,
beta1: float,
beta2: float,
lr: float,
weight_decay: float,
eps: float
):
for i, param in enumerate(params_with_grad):
grad = grads[i]
q_exp_avg = exp_avgs[i]
q_exp_avg_sq = exp_avg_sqs[i]
exp_avg_sq_row = exp_avg_sq_rows[i]
exp_avg_sq_col = exp_avg_sq_cols[i]
factored = exp_avg_sqs_factored[i]
step_t = state_steps[i]
# update step
step_t += 1
# Perform stepweight decay
param.mul_(1 - lr * weight_decay)
if factored:
_single_quantized_factored_update(
param,
grad,
q_exp_avg,
exp_avg_sq_row,
exp_avg_sq_col,
exp_avgs_q_enabled[i],
exp_avgs_q_overhead[i],
exp_avgs_qmap[i],
exp_avg_qmetadata,
lr,
beta1,
beta2,
eps,
step_t.item()
)
else:
exp_avg_q_overhead = exp_avgs_q_overhead[i]
exp_avg_sq_q_overhead = exp_avg_sqs_q_overhead[i]
# dequantize
if q_exp_avg.numel() <= 1:
q_exp_avg.data = exp_avg = torch.zeros_like(param, memory_format=torch.preserve_format)
elif exp_avgs_q_enabled[i]:
exp_avg_q_overhead.update(exp_avg_qmetadata)
exp_avg = vectorwise_dequant(q_exp_avg, qmap=exp_avgs_qmap[i], shape=param.shape, **exp_avg_q_overhead)
exp_avg_q_overhead.clear()
else:
exp_avg = q_exp_avg
if q_exp_avg_sq.numel() <= 1:
q_exp_avg_sq.data = exp_avg_sq = torch.zeros_like(param, memory_format=torch.preserve_format)
elif exp_avg_sqs_q_enabled[i]:
exp_avg_sq_q_overhead.update(exp_avg_sq_qmetadata)
exp_avg_sq = vectorwise_dequant(q_exp_avg_sq, qmap=exp_avg_sqs_qmap[i], shape=param.shape, **exp_avg_sq_q_overhead)
exp_avg_sq_q_overhead.clear()
else:
exp_avg_sq = q_exp_avg_sq
# Decay the first and second moment running average coefficient
exp_avg.lerp_(grad, 1 - beta1)
exp_avg_sq.mul_(beta2).addcmul_(grad, grad, value=1 - beta2)
step = step_t.item()
bias_correction1 = 1 - beta1 ** step
bias_correction2 = 1 - beta2 ** step
step_size = lr / bias_correction1
bias_correction2_sqrt = _dispatch_sqrt(bias_correction2)
denom = (exp_avg_sq.sqrt() / bias_correction2_sqrt).add_(eps)
param.addcdiv_(exp_avg, denom, value=-step_size)
# quantize
if exp_avgs_q_enabled[i]:
qx, gen = vectorwise_quant(exp_avg, qmap=exp_avgs_qmap[i], shape=param.shape, **exp_avg_qmetadata)
q_exp_avg.data = qx
exp_avg_q_overhead.update(gen)
else:
pass
if exp_avg_sqs_q_enabled[i]:
qx, gen = vectorwise_quant(exp_avg_sq, qmap=exp_avg_sqs_qmap[i], shape=param.shape, **exp_avg_sq_qmetadata)
q_exp_avg_sq.data = qx
exp_avg_sq_q_overhead.update(gen)
else:
pass
def _fused_adamw4bit(
params_with_grad: List[Tensor],
grads: List[Tensor],
exp_avgs: List[Tensor],
exp_avg_sqs: List[Tensor],
exp_avg_sqs_factored: List[bool],
exp_avg_sq_rows: List[Tensor],
exp_avg_sq_cols: List[Tensor],
state_steps: List[Tensor],
exp_avgs_q_enabled: List[bool],
exp_avg_sqs_q_enabled: List[bool],
exp_avgs_q_overhead: List,
exp_avg_sqs_q_overhead: List,
exp_avgs_qmap: List,
exp_avg_sqs_qmap: List,
exp_avg_qmetadata,
exp_avg_sq_qmetadata,
*,
beta1: float,
beta2: float,
lr: float,
weight_decay: float,
eps: float
):
for i, param in enumerate(params_with_grad):
grad = grads[i]
q_exp_avg = exp_avgs[i]
q_exp_avg_sq = exp_avg_sqs[i]
exp_avg_sq_row = exp_avg_sq_rows[i]
exp_avg_sq_col = exp_avg_sq_cols[i]
factored = exp_avg_sqs_factored[i]
step_t = state_steps[i]
if factored:
# fused_adam4bit do not apply to factored case
# update step
step_t += 1
# Perform stepweight decay
param.mul_(1 - lr * weight_decay)
_single_quantized_factored_update(
param,
grad,
q_exp_avg,
exp_avg_sq_row,
exp_avg_sq_col,
exp_avgs_q_enabled[i],
exp_avgs_q_overhead[i],
exp_avgs_qmap[i],
exp_avg_qmetadata,
lr,
beta1,
beta2,
eps,
step_t.item()
)
else:
# update step
step_t += 1
if exp_avgs_q_enabled[i] != exp_avg_sqs_q_enabled[i]:
raise ValueError(f"For same tensor, exp_avg and exp_avg_sq should be both quantized or unquantized simultaneously,"
f" but get ({exp_avgs_q_enabled[i]} {exp_avg_sqs_q_enabled[i]})")
if exp_avgs_q_enabled[i]:
if exp_avg_qmetadata["scale_type"] != "group":
print(f"Warning: fused_adamw4bit only support block-wise scaling, but get exp_avg scale_type {exp_avg_qmetadata['scale_type']}.")
if exp_avg_sq_qmetadata["scale_type"] != "group":
print(f"Warning: fused_adamw4bit only support block-wise scaling, but get exp_avg_sq scale_type {exp_avg_sq_qmetadata['scale_type']}.")
bytelength = (param.numel() + 1) // 2
if q_exp_avg.numel() <= 1:
q_exp_avg.data = torch.zeros((bytelength,), dtype=torch.int8, device=param.device)
if q_exp_avg_sq.numel() <= 1:
q_exp_avg_sq.data = torch.zeros((bytelength,), dtype=torch.int8, device=param.device)
blocks = (param.numel() + 127) // 128
if "max1" in exp_avgs_q_overhead[i]:
exp_avg_scale = exp_avgs_q_overhead[i]["max1"]
else:
exp_avg_scale = torch.zeros((blocks,), dtype=torch.float32, device=param.device)
exp_avgs_q_overhead[i]["max1"] = exp_avg_scale
if "max1" in exp_avg_sqs_q_overhead[i]:
exp_avg_sq_scale = exp_avg_sqs_q_overhead[i]["max1"]
else:
exp_avg_sq_scale = torch.zeros((blocks,), dtype=torch.float32, device=param.device)
exp_avg_sqs_q_overhead[i]["max1"] = exp_avg_sq_scale
with torch.cuda.device(param.device):
import lpmm.cpp_extension.fused_adamw as fused_adamw
fused_adamw.adamw4bit_single_tensor(
param,
grad,
q_exp_avg,
q_exp_avg_sq,
exp_avg_scale,
exp_avg_sq_scale,
exp_avgs_qmap[i],
exp_avg_sqs_qmap[i],
beta1,
beta2,
lr,
weight_decay,
eps,
step_t.item(),
)
else:
if q_exp_avg.numel() <= 1:
q_exp_avg.data = torch.zeros_like(param, memory_format=torch.preserve_format)
if q_exp_avg_sq.numel() <= 1:
q_exp_avg_sq.data = torch.zeros_like(param, memory_format=torch.preserve_format)
with torch.cuda.device(param.device):
import lpmm.cpp_extension.fused_adamw as fused_adamw
fused_adamw.adamw_single_tensor(
param,
grad,
q_exp_avg,
q_exp_avg_sq,
beta1,
beta2,
lr,
weight_decay,
eps,
step_t.item(),
)
def _dispatch_sqrt(x: float): # float annotation is needed because of torchscript type inference
if not torch.jit.is_scripting() and isinstance(x, torch.Tensor):
return x.sqrt()
else:
return math.sqrt(x)
def _approx_sq_grad(exp_avg_sq_row, exp_avg_sq_col):
# copy from fairseq's adafactor implementation:
# https://github.com/huggingface/transformers/blob/8395f14de6068012787d83989c3627c3df6a252b/src/transformers/optimization.py#L505
r_factor = (exp_avg_sq_row / exp_avg_sq_row.mean(dim=-1, keepdim=True)).unsqueeze(-1)
c_factor = exp_avg_sq_col.unsqueeze(-2)
return torch.mul(r_factor, c_factor)
def _single_quantized_factored_update(
param,
grad,
q_exp_avg,
exp_avg_sq_row,
exp_avg_sq_col,
exp_avg_q_enabled,
exp_avg_q_overhead,
exp_avg_qmap,
exp_avg_qmetadata,
lr,
beta1,
beta2,
eps,
step,
):
# dequantize
if q_exp_avg.numel() <= 1:
q_exp_avg.data = exp_avg = torch.zeros_like(param, memory_format=torch.preserve_format)
elif exp_avg_q_enabled:
exp_avg_q_overhead = exp_avg_q_overhead
exp_avg_q_overhead.update(exp_avg_qmetadata)
exp_avg = vectorwise_dequant(q_exp_avg, qmap=exp_avg_qmap, shape=param.shape, **exp_avg_q_overhead)
exp_avg_q_overhead.clear()
else:
exp_avg = q_exp_avg
# Decay the first and second moment running average coefficient
exp_avg.lerp_(grad, 1 - beta1)
update = (grad ** 2)
exp_avg_sq_row.mul_(beta2).add_(update.mean(dim=-1), alpha=1 - beta2)
exp_avg_sq_col.mul_(beta2).add_(update.mean(dim=-2), alpha=1 - beta2)
exp_avg_sq = _approx_sq_grad(exp_avg_sq_row, exp_avg_sq_col)
bias_correction1 = 1 - beta1 ** step
bias_correction2 = 1 - beta2 ** step
step_size = lr / bias_correction1
bias_correction2_sqrt = _dispatch_sqrt(bias_correction2)
denom = (exp_avg_sq.sqrt() / bias_correction2_sqrt).add_(eps)
param.addcdiv_(exp_avg, denom, value=-step_size)
# quantize
if exp_avg_q_enabled:
qx, gen = vectorwise_quant(exp_avg, qmap=exp_avg_qmap, shape=param.shape, **exp_avg_qmetadata)
q_exp_avg.data = qx
exp_avg_q_overhead.update(gen)
else:
pass