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# 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.
import math
import os
import torch
import torch.distributed as dist
from bitsandbytes.optim.optimizer import Optimizer2State
import bitsandbytes.functional as F
class Adam(Optimizer2State):
def __init__(self, params, lr=1e-3, betas=(0.9, 0.999), eps=1e-8,
weight_decay=0, amsgrad=False, optim_bits=32, args=None,
min_8bit_size=4096, percentile_clipping=100, block_wise=True):
super(Adam, self).__init__('adam', params, lr, betas, eps,
weight_decay, optim_bits, args, min_8bit_size, percentile_clipping, block_wise)
class Adam8bit(Optimizer2State):
def __init__(self, params, lr=1e-3, betas=(0.9, 0.999), eps=1e-8,
weight_decay=0, amsgrad=False, args=None,
min_8bit_size=4096, percentile_clipping=100, block_wise=True):
super(Adam8bit, self).__init__('adam', params, lr, betas, eps,
weight_decay, 8, args, min_8bit_size, percentile_clipping, block_wise)
class Adam32bit(Optimizer2State):
def __init__(self, params, lr=1e-3, betas=(0.9, 0.999), eps=1e-8,
weight_decay=0, amsgrad=False, args=None,
min_8bit_size=4096, percentile_clipping=100, block_wise=True):
super(Adam32bit, self).__init__('adam', params, lr, betas, eps,
weight_decay, 32, args, min_8bit_size, percentile_clipping, block_wise)
class AnalysisAdam(torch.optim.Optimizer):
"""Adam that performs 8-bit vs 32-bit error analysis.
This implementation is modified from torch.optim.Adam based on:
`Fixed Weight Decay Regularization in Adam`
(see https://arxiv.org/abs/1711.05101)
It has been proposed in `Adam: A Method for Stochastic Optimization`_.
Arguments:
params (iterable): iterable of parameters to optimize or dicts defining
parameter groups
lr (float, optional): learning rate (default: 1e-3)
betas (Tuple[float, float], optional): coefficients used for computing
running averages of gradient and its square (default: (0.9, 0.999))
eps (float, optional): term added to the denominator to improve
numerical stability (default: 1e-8)
weight_decay (float, optional): weight decay (L2 penalty) (default: 0)
amsgrad (boolean, optional): whether to use the AMSGrad variant of this
algorithm from the paper `On the Convergence of Adam and Beyond`_
.. _Adam: A Method for Stochastic Optimization:
https://arxiv.org/abs/1412.6980
.. _On the Convergence of Adam and Beyond:
https://openreview.net/forum?id=ryQu7f-RZ
"""
def __init__(
self,
params,
lr=1e-3,
betas=(0.9, 0.999),
eps=1e-8,
weight_decay=0,
amsgrad=False,
bnb_analysis='dynamic-blockwise',
savedir=None
):
defaults = dict(
lr=lr, betas=betas, eps=eps, weight_decay=weight_decay, amsgrad=amsgrad
)
super(AnalysisAdam, self).__init__(params, defaults)
self.analysis = bnb_analysis
self.savedir = savedir
@property
def supports_memory_efficient_fp16(self):
return True
@property
def supports_flat_params(self):
return True
def step(self, closure=None):
"""Performs a single optimization step.
Arguments:
closure (callable, optional): A closure that reevaluates the model
and returns the loss.
"""
loss = None
if closure is not None:
loss = closure()
for group in self.param_groups:
for p_id, p in enumerate(group["params"]):
if p.grad is None:
continue
grad = p.grad.data
if grad.dtype in {torch.float16, torch.bfloat16}:
grad = grad.float()
if grad.is_sparse:
raise RuntimeError(
"Adam does not support sparse gradients, please consider SparseAdam instead"
)
amsgrad = group.get("amsgrad", False)
assert not amsgrad
p_data_fp32 = p.data
if p.data.dtype in {torch.float16, torch.bfloat16}:
p_data_fp32 = p_data_fp32.float()
state = self.state[p]
# State initialization
if len(state) == 0:
state["step"] = 0
# Exponential moving average of gradient values
state["exp_avg"] = torch.zeros_like(p_data_fp32)
# Exponential moving average of squared gradient values
state["exp_avg_sq"] = torch.zeros_like(p_data_fp32)
state['abserrors'] = torch.zeros((256, 256), device=p_data_fp32.device)
state['relerrors'] = torch.zeros((256, 256), device=p_data_fp32.device)
state['counts'] = torch.zeros((256, 256), device=p_data_fp32.device)
if amsgrad:
# Maintains max of all exp. moving avg. of sq. grad. values
state["max_exp_avg_sq"] = torch.zeros_like(p_data_fp32)
else:
state["exp_avg"] = state["exp_avg"].to(p_data_fp32)
state["exp_avg_sq"] = state["exp_avg_sq"].to(p_data_fp32)
if amsgrad:
state["max_exp_avg_sq"] = state["max_exp_avg_sq"].to(
p_data_fp32
)
state["step"] += 1
beta1, beta2 = group["betas"]
bias_correction1 = 1 - beta1 ** state["step"]
bias_correction2 = 1 - beta2 ** state["step"]
step_size = group["lr"] * math.sqrt(bias_correction2) / bias_correction1
e = state['abserrors']
rele = state['relerrors']
counts = state['counts']
if group["weight_decay"] != 0:
p_data_fp32.add_(
p_data_fp32, alpha=-group["weight_decay"] * group["lr"]
)
exp_avg, exp_avg_sq = state["exp_avg"], state["exp_avg_sq"]
if amsgrad:
max_exp_avg_sq = state["max_exp_avg_sq"]
# Decay the first and second moment running average coefficient
exp_avg.mul_(beta1).add_(grad, alpha=1 - beta1)
exp_avg_sq.mul_(beta2).addcmul_(grad, grad, value=1 - beta2)
denom = exp_avg_sq.sqrt().add_(group["eps"])
update_fp32 = exp_avg/denom
if p_data_fp32.numel() <= 8192 or p_data_fp32.numel() > 50000*1000:
# embedding layer or too small
p_data_fp32 += -step_size*update_fp32
else:
if self.analysis == 'dynamic-blockwise':
code1 = F.create_dynamic_map(signed=True).to(p.device)
code2 = F.create_dynamic_map(signed=False).to(p.device)
C1, S1 = F.quantize_blockwise(exp_avg, code=code1)
state1 = F.dequantize_blockwise(C1, S1)
C2, S2 = F.quantize_blockwise(exp_avg_sq, code=code2)
state2 = F.dequantize_blockwise(C2, S2)
elif self.analysis == 'dynamic':
code1 = F.create_dynamic_map(signed=True).to(p.device)
code2 = F.create_dynamic_map(signed=False).to(p.device)
C1, S1 = F.quantize(exp_avg, code=code1)
state1 = F.dequantize(C1, S1)
C2, S2 = F.quantize(exp_avg_sq, code=code2)
state2 = F.dequantize(C2, S2)
elif self.analysis == 'linear':
code1 = F.create_linear_map(signed=True).to(p.device)
code2 = F.create_linear_map(signed=False).to(p.device)
C1, S1 = F.quantize(exp_avg, code=code1)
state1 = F.dequantize(C1, S1)
C2, S2 = F.quantize(exp_avg_sq, code=code2)
state2 = F.dequantize(C2, S2)
elif self.analysis == 'quantile':
code1 = F.estimate_quantiles(exp_avg)
code2 = F.estimate_quantiles(exp_avg_sq)
C1 = F.quantize_no_absmax(exp_avg, code=code1)
state1 = F.dequantize_no_absmax(C1, code1)
C2 = F.quantize_no_absmax(exp_avg_sq, code=code2)
state2 = F.dequantize_no_absmax(C2, code2)
elif self.analysis == 'my-quantization-routine':
pass
# 1. get code
# 2. quantize
# 3. dequantize
# Error will be calculated automatically!
else:
raise ValueError(f'Invalid analysis value: {self.analysis}!')
denom = state2.sqrt().add_(group["eps"])
update_8bit = state1/denom
abserr = torch.abs(update_8bit-update_fp32)
relerr = abserr/torch.abs(update_fp32+1e-6)
C1, C2 = C1.int(), C2.int()
F.histogram_scatter_add_2d(e, C1.int(), C2.int(), abserr)
F.histogram_scatter_add_2d(rele, C1.int(), C2.int(), relerr)
F.histogram_scatter_add_2d(counts, C1.int(), C2.int(), torch.ones_like(abserr))
p_data_fp32 += -step_size*update_fp32
if not dist.is_initialized() or dist.get_rank() == 0:
if self.savedir != '' and state['step'] % 100 == 0:
if not os.path.exists(self.savedir): os.makedirs(self.savedir)
shapestr = '_'.join([str(dim) for dim in p_data_fp32.shape])
pathe = os.path.join(self.savedir, f'{p_id}_{shapestr}_abserr.pkl')
pathrele = os.path.join(self.savedir, f'{p_id}_{shapestr}_relerr.pkl')
pathcounts = os.path.join(self.savedir, f'{p_id}_{shapestr}_counts.pkl')
torch.save(e, pathe)
torch.save(rele, pathrele)
torch.save(counts, pathcounts)
if p.data.dtype in {torch.float16, torch.bfloat16}:
p.data.copy_(p_data_fp32)
return loss
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