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lora_finetune_single_device.py
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lora_finetune_single_device.py
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# Copyright (c) Meta Platforms, Inc. and affiliates.
# All rights reserved.
#
# This source code is licensed under the BSD-style license found in the
# LICENSE file in the root directory of this source tree.
import os
import sys
import time
from functools import partial
from typing import Any, Dict, Optional, Tuple, Union
from warnings import warn
import torch
from omegaconf import DictConfig, ListConfig
from torch import nn
from torch.optim import Optimizer
from torch.utils.data import DataLoader, DistributedSampler
from torchtune import config, modules, utils
from torchtune.datasets import ConcatDataset
from torchtune.modules.peft.peft_utils import (
get_adapter_params,
get_lora_module_names,
get_merged_lora_ckpt,
set_trainable_params,
validate_missing_and_unexpected_for_lora,
)
from torchtune.recipe_interfaces import FTRecipeInterface
from torchtune.utils import DummyProfiler, PROFILER_KEY
from tqdm import tqdm
log = utils.get_logger("DEBUG")
class LoRAFinetuneRecipeSingleDevice(FTRecipeInterface):
"""
LoRA finetuning recipe for dense transformer-based LLMs such as Llama2. This recipe is optimized
for single GPU training. Training on CPU is not supported.
Features:
- Activation Checkpointing. This can be controlled using the ``activation_checkpointing``
flag. Activation checkpointing helps reduce the memory footprint since we no longer keep
activations in memory and instead recompute them during the backward pass. This is especially
helpful for larger batch sizes when you're memory constrained. But these savings in memory
come at the cost of training performance. In most cases training can slow-down quite a bit as
a result of this activation recomputation.
- Precision. Full fp32 and bf16 training are supported. Precision is controlled using the ``dtype``
flag. When ``dtype=bf16``, all activations, gradients and optimizer states are in bfloat16. In
most cases this should halve the memory footprint of full precision (fp32) training, without
loss in model quality (will depend on the model, training data and other settings). For
GPUs which do not support bfloat16, we fall back to fp32. Mixed precision training and fp16
precision are currently not supported.g
- Gradient Accumulation. You can simulate larger batch sizes by accumulating gradients. This is
controlled using the ``gradient_accumulation_steps`` flag.
Total Batch Size = batch_size * gradient accumulation steps.
For example: with batch_size=1 and gradient_accumulation_steps=32 we get a total batch size of 32.
Gradient accumulation is especially useful when you are memory constrained. In this case,
accumulating gradients might give you better training speed than enabling activation
checkpointing.
- Lower precision optimizers. This recipe supports lower-precision optimizers from the bitsandbytes
library (https://huggingface.co/docs/bitsandbytes/main/en/index). We've tested the recipe with
8-bit AdamW and Paged AdamW.
- Checkpointing. Model weights are checkpointed both at the end of each epoch and at the end of
training. Currently we checkpoint both the adapter weights (trainable params only) and the
complete merged weights (adapter weights added back to the base model). For more details
please take a look at our LoRA tutorial
(https://pytorch.org/torchtune/main/tutorials/lora_finetune.html).
Optimizer State and recipe state (seed, total_epochs, number of epochs run etc) are
only saved at the end of a given epoch and used in case of resuming training. Resuming
training is controlled by the ``resume_from_checkpoint`` flag. Mid-epoch checkpointing is
currently not supported.
For more details on the checkpointer, please take a look at
our checkpointer deepdive (https://pytorch.org/torchtune/main/tutorials/checkpointer.html).
- Logging. Terminal, Disk, WandB and TensorBoard are all supported.
For a full list of example configs for this recipe, run ``tune ls`` on the command line. Each config
has example commands for how to kick-off training.
Args:
cfg (DictConfig): OmegaConf object parsed from yaml file
Raises:
ValueError: If ``dtype`` is set to fp16.
RuntimeError: If ``dtype`` is set to bf16 and the hardware does not support bf16.
"""
def __init__(self, cfg: DictConfig) -> None:
self._device = utils.get_device(device=cfg.device)
# Reduced precision logic
self._dtype = utils.get_dtype(cfg.dtype, device=self._device)
# fp16 precision is explicitly disabled as it is not supported in this
# recipe (for example, no gradient scaling).
if self._dtype == torch.float16:
raise ValueError(
"fp16 precision is not supported in this recipe. Please use fp32 or bf16."
)
# For CUDA devices, check if the HW supports bf16 if bf16 is specified.
if (
self._dtype == torch.bfloat16
and self._device != torch.device("cpu")
and not torch.cuda.is_bf16_supported()
):
raise RuntimeError("Full bf16 training is not supported on this hardware.")
# logging attributes
self._output_dir = cfg.output_dir
self._log_every_n_steps = cfg.get("log_every_n_steps", 1)
self._log_peak_memory_stats = cfg.get("log_peak_memory_stats", False)
# These are public properties which are updated by the checkpoint loader
# when ``resume_from_checkpoint`` is `True` or validated in tests
self.seed = utils.set_seed(seed=cfg.seed)
self.epochs_run = 0
self.total_epochs = cfg.epochs
self.max_steps_per_epoch = cfg.max_steps_per_epoch
self.global_step = 0
self._resume_from_checkpoint = cfg.resume_from_checkpoint
self._gradient_accumulation_steps = cfg.gradient_accumulation_steps
def load_checkpoint(self, cfg_checkpointer: DictConfig) -> Dict[str, Any]:
"""
Extract the checkpoint state from file and validate. This includes the
base model weights. If resume_from_checkpoint is True, this also includes
the adapter weights and recipe state
"""
self._checkpointer = config.instantiate(
cfg_checkpointer,
resume_from_checkpoint=self._resume_from_checkpoint,
)
checkpoint_dict = self._checkpointer.load_checkpoint()
if self._resume_from_checkpoint:
if utils.ADAPTER_KEY not in checkpoint_dict:
raise ValueError(
"Adapter weights not found. Please ensure a valid adapter checkpoint is provided."
)
# _update_recipe_state will throw an exception if the recipe state is not corrctly loaded
# no need to check here
self._update_recipe_state(checkpoint_dict)
return checkpoint_dict
def _update_recipe_state(self, ckpt_dict: Dict[str, Any]) -> None:
"""
Updates the recipe state from checkpoint.
"""
try:
self.epochs_run = ckpt_dict[utils.EPOCHS_KEY]
# on mismatch, warn the user and prevent the override
if self.seed != ckpt_dict[utils.SEED_KEY]:
warn(
message=(
"Config value for seed does not match the checkpoint value, "
f"using the checkpoint value: {ckpt_dict[utils.SEED_KEY]}"
)
)
self.seed = ckpt_dict[utils.SEED_KEY]
if self.max_steps_per_epoch != ckpt_dict[utils.MAX_STEPS_KEY]:
warn(
message=(
"Config value for max_steps_per_epoch does not match the checkpoint value, "
f"using the checkpoint value: {ckpt_dict[utils.MAX_STEPS_KEY]}"
)
)
self.max_steps_per_epoch = ckpt_dict[utils.MAX_STEPS_KEY]
# on mismatch, warn the user but allow the override
if self.total_epochs != ckpt_dict[utils.TOTAL_EPOCHS_KEY]:
warn(
message=(
"Config value for total_epochs does not match the checkpoint value, "
f"using the config value: {self.total_epochs}"
)
)
except KeyError as e:
raise KeyError(
"Checkpoint does not contain the required keys needed for updating recipe state. "
"Are you sure you passed in the right recipe checkpoint?"
) from e
def setup(self, cfg: DictConfig) -> None:
"""
Setup the recipe state. This includes recipe state (if resume_from_checkpoint is True),
model, tokenizer, loss, optimizer, learning rate scheduler, sampler, and dataloader.
"""
self._metric_logger = config.instantiate(cfg.metric_logger)
# log config with parameter override
self._metric_logger.log_config(cfg)
self._model_compile = cfg.compile
checkpoint_dict = self.load_checkpoint(cfg_checkpointer=cfg.checkpointer)
self._model = self._setup_model(
cfg_model=cfg.model,
enable_activation_checkpointing=cfg.enable_activation_checkpointing,
compile_model=cfg.compile,
base_model_state_dict=checkpoint_dict[utils.MODEL_KEY],
lora_weights_state_dict=(
checkpoint_dict[utils.ADAPTER_KEY]
if self._resume_from_checkpoint
else None
),
)
self._tokenizer = config.instantiate(cfg.tokenizer)
log.info("Tokenizer is initialized from file.")
self._optimizer = self._setup_optimizer(
cfg_optimizer=cfg.optimizer,
opt_state_dict=(
checkpoint_dict[utils.OPT_KEY] if self._resume_from_checkpoint else None
),
)
self._loss_fn = config.instantiate(cfg.loss)
log.info("Loss is initialized.")
# Dataloader depends on the tokenizer and loss_fn and should be
# setup after all of these are setup
self._sampler, self._dataloader = self._setup_data(
cfg_dataset=cfg.dataset,
shuffle=cfg.shuffle,
batch_size=cfg.batch_size,
)
# Finally update the recipe state which can only be correctly set after all of the
# other components have been initialized and updated.
# Number of training steps in each epoch depends on the number of batches produced
# by the dataloader and the max_steps_per_epoch param set by the user and is used
# for logging and tracking training state. This should be computed after the dataloader
# has been setup
self._steps_per_epoch = (
len(self._dataloader) // self._gradient_accumulation_steps
)
if (
self.max_steps_per_epoch is not None
and self.max_steps_per_epoch < self._steps_per_epoch
):
self._steps_per_epoch = self.max_steps_per_epoch
self.global_step = self.epochs_run * self._steps_per_epoch
# Learning rate scheduler can only be set up after number of steps
# has been computed
self._lr_scheduler = self._setup_lr_scheduler(
cfg_lr_scheduler=cfg.lr_scheduler,
num_training_steps=self.total_epochs * self._steps_per_epoch,
last_epoch=self.global_step - 1,
)
# Set up profiler, returns DummyProfiler (nullcontext object with no-op `step` method)
# if cfg is missing profiler key or if `cfg.profiler.enabled = False
self._profiler = self._setup_profiler(cfg.get(PROFILER_KEY, None))
def _setup_profiler(
self, cfg_profiler: DictConfig
) -> Union[torch.profiler.profile, DummyProfiler]:
"""
Parses the `profiler` section of top-level `cfg` and sets up profiler
Args:
cfg_profiler: DictConfig - `profiler` section of the top-level `cfg` (the main config passed to `recipe.main`)
Returns:
profiler: Union[torch.profiler.profile, DummyProfiler] - DummyProfiler is a nullcontext with no-op methods
for `start`, `stop`, and `step` that can be used in place of `torch.profiler.profile` if profiler is not enabled such
that the instrumented training loop does not need to be changed profiling is disabled.
The profiler config can be provided in configs under the `profiler` key with the following layout:
.. code-block:: yaml
profiler:
enabled: bool
#Output directory of trace artifacts
output_dir: str
#`torch.profiler.ProfilerActivity` types to trace
cpu: bool
cuda: bool
#Trace options
profile_memory: bool
with_stack: bool
record_shapes: bool
with_flops: bool
# `torch.profiler.schedule` options:
# wait_steps -> wait, warmup_steps -> warmup, active_steps -> active, num_cycles -> repeat
wait_steps: int
warmup_steps: int
active_steps: int
num_cycles: int
"""
# Missing profiler section in config, assume disabled
if cfg_profiler is None:
cfg_profiler = DictConfig({"enabled": False})
# Check that component is included and set correctly
if cfg_profiler.get("_component_", None) is None:
cfg_profiler["_component_"] = "torchtune.utils.setup_torch_profiler"
else:
assert (
cfg_profiler.get("_component_")
== "torchtune.utils.setup_torch_profiler"
), "Only torch profiler supported currently: component must be `torchtune.utils.setup_torch_profiler`"
profiler, profiler_cfg = config.instantiate(cfg_profiler)
log.info(f" Profiler config after instantiation: {profiler_cfg}")
return profiler
def _setup_model(
self,
cfg_model: DictConfig,
enable_activation_checkpointing: bool,
compile_model: bool,
base_model_state_dict: Dict[str, Any],
lora_weights_state_dict: Optional[Dict[str, Any]] = None,
) -> nn.Module:
with utils.set_default_dtype(self._dtype), self._device:
model = config.instantiate(cfg_model)
self._lora_rank = cfg_model.lora_rank
self._lora_alpha = cfg_model.lora_alpha
self._lora_attn_modules = list(cfg_model.lora_attn_modules)
self._apply_lora_to_mlp = cfg_model.apply_lora_to_mlp
self._apply_lora_to_output = getattr(cfg_model, "apply_lora_to_output", False)
self.adapter_params = get_adapter_params(model)
set_trainable_params(model, self.adapter_params)
if enable_activation_checkpointing:
utils.set_activation_checkpointing(
model, auto_wrap_policy={modules.TransformerDecoderLayer}
)
base_missing, base_unexpected = model.load_state_dict(
base_model_state_dict, strict=False
)
if lora_weights_state_dict:
lora_missing, lora_unexpected = model.load_state_dict(
lora_weights_state_dict, strict=False
)
else:
lora_missing, lora_unexpected = None, None
validate_missing_and_unexpected_for_lora(
lora_attn_modules=self._lora_attn_modules,
apply_lora_to_mlp=self._apply_lora_to_mlp,
apply_lora_to_output=self._apply_lora_to_output,
base_missing=base_missing,
base_unexpected=base_unexpected,
lora_missing=lora_missing,
lora_unexpected=lora_unexpected,
)
# Validate model adapter params were loaded in with the expected dtype
# TODO (rohan-varma): Further validation to ensure the appropriate base params
# are NF4 vs bf16 based on the quantization config.
utils.validate_expected_param_dtype(
self.adapter_params.items(), dtype=self._dtype
)
log.info(f"Model is initialized with precision {self._dtype}.")
# Compile model, if enabled.
if compile_model:
log.info("Compiling model with torch.compile...")
backend = os.environ.get("TORCH_COMPILE_BACKEND", "inductor")
model.compile(backend=backend)
if self._device.type == "cuda":
memory_stats = utils.get_memory_stats(device=self._device)
utils.log_memory_stats(memory_stats)
return model
def _setup_optimizer(
self, cfg_optimizer: DictConfig, opt_state_dict: Optional[Dict[str, Any]] = None
) -> Optimizer:
optimizer = config.instantiate(cfg_optimizer, self._model.parameters())
if opt_state_dict:
optimizer.load_state_dict(opt_state_dict)
log.info("Optimizer and loss are initialized.")
return optimizer
def _setup_lr_scheduler(
self,
cfg_lr_scheduler: DictConfig,
num_training_steps: int,
last_epoch: int,
) -> Optimizer:
lr_scheduler = config.instantiate(
cfg_lr_scheduler,
self._optimizer,
num_training_steps=num_training_steps,
last_epoch=last_epoch,
)
log.info("Learning rate scheduler is initialized.")
return lr_scheduler
def _setup_data(
self,
cfg_dataset: DictConfig,
shuffle: bool,
batch_size: int,
) -> Tuple[DistributedSampler, DataLoader]:
"""
All data related setup happens here. Currently this recipe only supports
Map-style Datasets which fit into memory and an option for random shuffling.
Samplers, iterable datasets, and streaming datasets are not supported.
"""
if isinstance(cfg_dataset, ListConfig):
datasets = [
config.instantiate(single_cfg_dataset, tokenizer=self._tokenizer)
for single_cfg_dataset in cfg_dataset
]
ds = ConcatDataset(datasets=datasets)
packed = False
else:
ds = config.instantiate(cfg_dataset, tokenizer=self._tokenizer)
packed = cfg_dataset.get("packed", False)
sampler = DistributedSampler(
ds,
num_replicas=1,
rank=0,
shuffle=shuffle,
seed=0,
)
dataloader = DataLoader(
dataset=ds,
sampler=sampler,
batch_size=batch_size,
collate_fn=partial(
utils.padded_collate,
padding_idx=self._tokenizer.pad_id,
ignore_idx=self._loss_fn.ignore_index,
)
if not packed
else None,
)
log.info("Dataset and Sampler are initialized.")
return sampler, dataloader
def save_checkpoint(self, epoch: int) -> None:
"""
Checkpoint the state of the recipe. The constructed checkpoint state dict
contains the following information:
- Merged weights with key MODEL_KEY
- Adapter weights with key ADAPTER_KEY
- Relevant recipe state if training is not complete
Checkpointer will save the merged weights, adapter weights and recipe state in
different checkpoint files. To correctly resume from training, the adapter weights
and recipe state must be provided along with the base model weights.
"""
ckpt_dict = {}
# if training is in-progress, checkpoint the optimizer state as well
if epoch + 1 < self.total_epochs:
ckpt_dict.update(
{
utils.OPT_KEY: self._optimizer.state_dict(),
utils.SEED_KEY: self.seed,
utils.EPOCHS_KEY: self.epochs_run,
utils.TOTAL_EPOCHS_KEY: self.total_epochs,
utils.MAX_STEPS_KEY: self.max_steps_per_epoch,
}
)
# Move to CPU to avoid a copy on GPU
state_dict = {k: v.cpu() for k, v in self._model.state_dict().items()}
# Construct the full state dict with LoRA weights merged into base LLM weights
merged_state_dict = get_merged_lora_ckpt(
state_dict,
rank=self._lora_rank,
alpha=self._lora_alpha,
)
ckpt_dict.update({utils.MODEL_KEY: merged_state_dict})
# Construct the adapter weights
adapter_key_filter = lambda x: x in self.adapter_params
adapter_state_dict = {
k: v for k, v in self._model.state_dict().items() if adapter_key_filter(k)
}
ckpt_dict.update({utils.ADAPTER_KEY: adapter_state_dict})
adapter_config = {
"r": self._lora_rank,
"lora_alpha": self._lora_alpha,
"target_modules": get_lora_module_names(
self._lora_attn_modules,
self._apply_lora_to_mlp,
self._apply_lora_to_output,
),
"peft_type": "LORA",
}
ckpt_dict.update({utils.ADAPTER_CONFIG: adapter_config})
self._checkpointer.save_checkpoint(
ckpt_dict,
epoch=epoch,
intermediate_checkpoint=(epoch + 1 < self.total_epochs),
)
def train(self) -> None:
"""
The core training loop.
"""
if self._model_compile:
log.info(
"NOTE: torch.compile is enabled and model is compiled in first forward. Expect a relatively slow first iteration."
)
# Initialize tokens count and running loss (for grad accumulation)
t0 = time.perf_counter()
running_loss = 0
num_tokens = 0
with self._profiler as prof:
# self.epochs_run should be non-zero when we're resuming from a checkpoint
for curr_epoch in range(self.epochs_run, self.total_epochs):
# Update the sampler to ensure data is correctly shuffled across epochs
# in case shuffle is True
self._sampler.set_epoch(curr_epoch)
pbar = tqdm(total=self._steps_per_epoch)
for idx, batch in enumerate(self._dataloader):
if (
self.max_steps_per_epoch is not None
and (idx // self._gradient_accumulation_steps)
== self.max_steps_per_epoch
):
break
# Both are shape [b, s]
tokens, labels = batch["tokens"], batch["labels"]
# Get the attention mask and position ids from the dataset if they
# exist. Currently, only sample packing in PackedDataset returns these
mask = batch.get("mask", None) # shape [b, s, s]
input_pos = batch.get("input_pos", None) # shape [b, s]
tokens = tokens.to(self._device)
num_tokens += tokens.numel()
labels = labels.to(self._device)
mask = mask.to(self._device) if mask is not None else None
input_pos = (
input_pos.to(self._device) if input_pos is not None else None
)
logits = self._model(tokens, mask=mask, input_pos=input_pos)
# Shift so that tokens < n predict n
logits = logits[..., :-1, :].contiguous()
labels = labels[..., 1:].contiguous()
logits = logits.transpose(1, 2)
# Compute loss
loss = self._loss_fn(logits, labels)
loss = loss / self._gradient_accumulation_steps
running_loss += loss
loss.backward()
# Step with optimizer
if (idx + 1) % self._gradient_accumulation_steps == 0:
self._optimizer.step()
self._optimizer.zero_grad(set_to_none=True)
self._lr_scheduler.step()
# Update the number of steps when the weights are updated
self.global_step += 1
loss_to_log = running_loss.item()
pbar.update(1)
pbar.set_description(
f"{curr_epoch+1}|{self.global_step}|Loss: {loss_to_log}"
)
# Log per-step metrics
if self.global_step % self._log_every_n_steps == 0:
time_per_step = time.perf_counter() - t0
log_dict = {
"loss": loss_to_log,
"lr": self._optimizer.param_groups[0]["lr"],
"tokens_per_second_per_gpu": num_tokens / time_per_step,
}
if (
self._device.type == "cuda"
and self._log_peak_memory_stats
):
log_dict.update(
utils.get_memory_stats(device=self._device)
)
self._metric_logger.log_dict(
log_dict,
step=self.global_step,
)
# Reset running stats for the next step
running_loss = 0
num_tokens = 0
t0 = time.perf_counter()
# Step the profiler
# Note we are stepping each batch, which might not include optimizer step in the trace
# if the schedule cycle doesn't align with gradient accumulation.
prof.step()
self.epochs_run += 1
self.save_checkpoint(epoch=curr_epoch)
def cleanup(self) -> None:
self._metric_logger.close()
@config.parse
def recipe_main(cfg: DictConfig) -> None:
"""
Entry point for the recipe.
Configurable parameters are read in the following order:
- Parameters specified in config (see available configs through ``tune ls``)
- Overwritten by arguments from the command-line
"""
config.log_config(recipe_name="LoRAFinetuneRecipeSingleDevice", cfg=cfg)
recipe = LoRAFinetuneRecipeSingleDevice(cfg=cfg)
recipe.setup(cfg=cfg)
recipe.train()
recipe.cleanup()
if __name__ == "__main__":
sys.exit(recipe_main())