task.py

import os
from dataclasses import asdict
from itertools import cycle, islice
from pathlib import Path

import hivemind
import torch
import torch.nn as nn
import transformers
from dalle_pytorch import DALLE
from dalle_pytorch.vae import VQGanVAE
from hivemind import SizeAdaptiveCompression, Float16Compression, Uniform8BitQuantization
from transformers import DataCollatorWithPadding, T5TokenizerFast, get_linear_schedule_with_warmup

import utils
from arguments import HFTrainerArguments, BasePeerArguments, CollaborativeArguments
from data import make_dataset
from huggingface_auth import authorize_with_huggingface
from lib.training.lamb_8bit import CPULAMB8Bit


logger = hivemind.get_logger(__name__)


class VQGanParams(VQGanVAE):
    def __init__(self, *, num_layers=3, image_size=256, num_tokens=8192, is_gumbel=True):
        nn.Module.__init__(self)

        self.num_layers = num_layers
        self.image_size = image_size
        self.num_tokens = num_tokens
        self.is_gumbel = is_gumbel


class ModelWrapper(nn.Module):
    def __init__(self, model):
        super().__init__()
        self.model = model

    def forward(self, input_ids, attention_mask, image):
        loss = self.model.forward(text=input_ids, image=image, mask=attention_mask, return_loss=True)
        return {'loss': loss}


class TrainingTask:
    """A container that defines the training config, model, tokenizer, optimizer and other local training utilities"""
    _authorizer = _dht = _collaborative_optimizer = _training_dataset = None


    def __init__(
            self, peer_args: BasePeerArguments, trainer_args: HFTrainerArguments, collab_args: CollaborativeArguments):
        self.peer_args, self.trainer_args, self.collab_args = peer_args, trainer_args, collab_args
        self.trainer_args.run_name = self.authorizer.username  # For wandb

        self.validators, self.local_public_key = utils.make_validators(self.peer_args.experiment_prefix)
        transformers.set_seed(trainer_args.seed)  # seed used for initialization

        self.tokenizer = T5TokenizerFast.from_pretrained(peer_args.tokenizer_path)
        self.tokenizer.pad_token = self.tokenizer.eos_token

        logger.info(f"Creating model")
        depth = 64
        attn_types = list(islice(cycle(['axial_row', 'axial_col', 'axial_row', 'axial_row']), depth - 1))
        attn_types.append('conv_like')
        shared_layer_ids = list(islice(cycle(range(4)), depth - 1))
        shared_layer_ids.append('w_conv')
        dalle = DALLE(
            vae=VQGanParams(),
            num_text_tokens=self.tokenizer.vocab_size,
            text_seq_len=trainer_args.text_seq_length,
            dim=1024,
            depth=depth,
            heads=16,
            dim_head=64,
            attn_types=attn_types,
            ff_dropout=0,
            attn_dropout=0,
            shared_attn_ids=shared_layer_ids,
            shared_ff_ids=shared_layer_ids,
            rotary_emb=True,
            reversible=True,
            share_input_output_emb=True,
        )
        logger.info(f"Trainable parameters: "
                    f"{sum(param.numel() for param in dalle.parameters() if param.requires_grad)}")
        self.model = ModelWrapper(dalle)

        output_dir = Path(trainer_args.output_dir)
        logger.info(f'Checkpoint dir {output_dir}, contents {list(output_dir.glob("checkpoint*"))}')
        latest_checkpoint_dir = max(output_dir.glob("checkpoint*"), default=None, key=os.path.getctime)
        if latest_checkpoint_dir is not None:
            logger.info(f"Loading model from {latest_checkpoint_dir}")
            self.model.load_state_dict(torch.load(f"{latest_checkpoint_dir}/model_state.pt"))

    @property
    def authorizer(self):
        if self._authorizer is None and self.peer_args.authorize:
            self._authorizer = authorize_with_huggingface()
        return self._authorizer

    @property
    def dht(self):
        if self._dht is None:
            self._dht = hivemind.DHT(
                start=True,
                initial_peers=self.peer_args.initial_peers,
                client_mode=self.peer_args.client_mode,
                host_maddrs=self.peer_args.host_maddrs,
                announce_maddrs=self.peer_args.announce_maddrs,
                use_ipfs=self.peer_args.use_ipfs,
                record_validators=self.validators,
                identity_path=self.peer_args.identity_path,
                authorizer=self.authorizer,
            )
            if self.peer_args.client_mode:
                logger.info(f"Created client mode peer with peer_id={self._dht.peer_id}")
            else:
                utils.log_visible_maddrs(self._dht.get_visible_maddrs(), only_p2p=self.peer_args.use_ipfs)
        return self._dht

    @property
    def collaborative_optimizer(self):
        if self._collaborative_optimizer is None:
            params, opt, scheduler = self._get_local_optimizer_and_scheduler(self.trainer_args)
            averaging_compression = SizeAdaptiveCompression(
                threshold=2 ** 16 + 1, less=Float16Compression(), greater_equal=Uniform8BitQuantization())
            self._collaborative_optimizer = hivemind.Optimizer(
                dht=self.dht, run_id=self.peer_args.experiment_prefix,
                params=params, optimizer=opt, scheduler=scheduler,
                offload_optimizer=True, delay_grad_averaging=False, delay_optimizer_step=True,
                batch_size_per_step=self.trainer_args.batch_size_per_step,
                grad_compression=averaging_compression, state_averaging_compression=averaging_compression,
                client_mode=self.peer_args.client_mode, verbose=True,
                **asdict(self.collab_args))
        return self._collaborative_optimizer

    def _get_local_optimizer_and_scheduler(self, training_args: HFTrainerArguments):
        no_decay = ["bias", "LayerNorm.weight"]
        params = [
            {
                "params": [p for n, p in self.model.named_parameters()
                           if not any(nd in n for nd in no_decay) and p.requires_grad],
                "weight_decay": training_args.weight_decay,
            },
            {
                "params": [p for n, p in self.model.named_parameters()
                           if any(nd in n for nd in no_decay) and p.requires_grad],
                "weight_decay": 0.0,
            },
        ]

        opt = lambda params: CPULAMB8Bit(
            params,
            lr=training_args.learning_rate,
            betas=(training_args.adam_beta1, training_args.adam_beta2),
            eps=training_args.adam_epsilon,
            weight_decay=training_args.weight_decay,
            max_grad_norm=training_args.max_grad_norm,
            clamp_value=training_args.clamp_value,
            reuse_grad_buffers=True,
        )

        scheduler = lambda opt: get_linear_schedule_with_warmup(
            opt, num_warmup_steps=training_args.warmup_steps, num_training_steps=training_args.total_steps
        )

        return params, opt, scheduler

    @property
    def training_dataset(self):
        if self._training_dataset is None:
            self._training_dataset = make_dataset(
                self.tokenizer, shuffle_seed=hash(self.local_public_key) % 2 ** 31,
                max_sequence_length=self.trainer_args.text_seq_length
            )
        return self._training_dataset

    @property
    def data_collator(self):
        return DataCollatorWithPadding(tokenizer=self.tokenizer,
                                       padding='max_length', max_length=self.trainer_args.text_seq_length)