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import argparse
import json
import logging
import os
import time

from dataset import PeptidePairDataset, PeptidePairPicDataset, SimplePairClsDataset
from network import DMutaPeptide, DMutaPeptideCNN#, DMutaPeptideWiden
from sklearn.model_selection import KFold
from train import train_cls
import torch
import torch.nn as nn
from torch.utils.data import DataLoader, WeightedRandomSampler, RandomSampler, Subset
import numpy as np
from loss import MLCE, SuperLoss, LogCoshLoss, BMCLoss
from utils import set_seed


parser = argparse.ArgumentParser(description='resnet26')
# model setting
parser.add_argument('--model', type=str, default='resnet34',
                    help='resnet34 resnet50 densenet')
parser.add_argument('--q-encoder', dest='q_encoder', type=str, default='cnn',
                    help='lstm mamba mla')
parser.add_argument("--side-enc", dest='side_enc', type=str, default='lstm',
                    help="use side features")
parser.add_argument('--channels', type=int, default=16)
parser.add_argument('--fusion', type=str, default='att',
                    help='mlp att diff')
parser.add_argument('--glob-feat', dest='glob_feat', action='store_true', default=False,
                    help="use global features")
parser.add_argument('--non-siamese', dest='non_siamese', action='store_true', default=False,
                    help="use non-siamese architecture")
parser.add_argument('--widen', action='store_true', default=False,
                    help='use widen non-siamese architecture')

# task & dataset setting
parser.add_argument('--task', type=str, default='cls',
                    help='reg or cls')
parser.add_argument('--pdb-src', type=str, dest='pdb_src', default='af',
                    help='af or hf')
parser.add_argument('--data-ver', type=str, dest='data_ver', default='250228',
                    help='data version')
parser.add_argument('--one-way', action='store_true', dest='one_way', default=True,
                    help='use one-way constructed dataset')
parser.add_argument('--max-length', dest='max_length', type=int, default=30,
                    help='Max length for sequence filtering')
parser.add_argument('--split', type=int, default=5,
                    help="Split k fold in cross validation (default: 5)")
parser.add_argument('--run-folds', type=int, dest='run_folds', nargs='+', default=-1,
                    help='specify which folds to run')
parser.add_argument('--seed', type=int, default=1,
                    help="Seed (default: 1)")
parser.add_argument('--pcs', action='store_true', default=False,
                    help='Consider protease cut site')
parser.add_argument('--mix-pcs', dest='mix_pcs', action='store_true', default=False,
                    help='Consider protease cut site')
parser.add_argument('--resize', type=int, default=[768], nargs='+',
                    help='resize the image')
parser.add_argument('--llm-data', action='store_true', default=False,
                    help='Use LLM augmentation data')

# training setting
parser.add_argument('--gpu', type=int, default=0,
                    help='GPU index to use, -1 for CPU (default: 0)')
parser.add_argument('--batch-size', type=int, dest='batch_size', default=32,
                    help='input batch size for training (default: 128)')
parser.add_argument('--epochs', type=int, default=50,
                    help='number of epochs to train (default: 100)')
parser.add_argument('--lr', type=float, default=0.001,
                    help='learning rate (default: 0.001)')
parser.add_argument('--decay', type=float, default=0.0005,
                    help='weight decay (default: 0.0005)')
parser.add_argument('--warm-steps', type=int, dest='warm_steps', default=0,
                    help='number of warm start steps for learning rate (default: 10)')
parser.add_argument('--patience', type=int, default=10,
                    help='patience for early stopping (default: 10)')
parser.add_argument('--pretrain', type=str, dest='pretrain', default='',
                    help='path of the pretrain model')
parser.add_argument('--metric-avg', type=str, dest='metric_avg', default='macro',
                    help='metric average type')

parser.add_argument('--loss', type=str, default='ce',
                    help='loss function')
parser.add_argument('--dir', action='store_true', default=False,
                    help='use DIR')

parser.add_argument('--bias-curri', dest='bias_curri', action='store_true', default=False,
                    help='directly use loss as the training data (biased) or not (unbiased)')
parser.add_argument('--anti-curri', dest='anti_curri', action='store_true', default=False,
                    help='easy to hard (curri), hard to easy (anti)')
parser.add_argument('--std-coff', dest='std_coff', type=float, default=1,
                    help='the hyper-parameter of std')

parser.add_argument('--ft-epochs', dest='ft_epochs', type=int, default=15,
                    help='fine-tune epochs')
parser.add_argument('--ft-lr', dest='ft_lr', type=float, default=0.0002,
                    help='fine-tune learning rate')

parser.add_argument('--simple', dest='simple', action='store_true', default=False)

args = parser.parse_args()

if args.llm_data:
    args.simple = True

if args.simple:
    args.one_way = True

if args.run_folds == -1:
    args.run_folds = list(range(args.split))

def main():
    set_seed(args.seed)
    if args.task == 'reg':
        args.classes = 1
        if args.loss == "mse" or args.loss in ['ce']:
            args.loss = 'mse'
            criterion = nn.MSELoss()
        elif args.loss == "smoothl1":
            criterion = nn.SmoothL1Loss()
        elif args.loss == "super":
            criterion = SuperLoss()
        elif args.loss in ["bmc", "bmc_ln"]:
            criterion = BMCLoss()
        else:
            raise NotImplementedError("unimplemented regression task loss function")
    elif args.task == 'cls':
        args.classes = 2
        if args.loss == 'ce' or args.loss in ['mse', 'smoothl1', 'super']:
            args.loss = 'ce'
            criterion = nn.CrossEntropyLoss()
        else:
            raise NotImplementedError("unimplemented classification task loss function")
    else:
        raise NotImplementedError("unimplemented task")
    
    if args.q_encoder in ['cnn', 'rn18']:
        weight_dir = f'./run-{args.task}/{args.q_encoder}{f"-non-siamese" if args.non_siamese else ""}-{args.fusion}-{args.channels}{f"-{args.side_enc}" if args.side_enc else ""}{"-mixpcs" if args.mix_pcs else ""}{"-pcs" if args.pcs==True else ""}{"-simple" if args.simple else ""}{"-llm" if args.llm_data else ""}{"-" + "x".join(str(n) for n in args.resize) if args.resize else ""}{"-gf" if args.glob_feat else ""}{"-oneway" if args.one_way else ""}-{args.loss + "-dir" if args.dir else args.loss}-{str(args.batch_size)}-{str(args.lr)}-{str(args.epochs)}'
    else:
        weight_dir = f'./run-{args.task}/{args.q_encoder}{f"-non-siamese" if args.non_siamese else ""}-{args.fusion}-{args.channels}{"-simple" if args.simple else ""}{"-llm" if args.llm_data else ""}{"-gf" if args.glob_feat else ""}{"-oneway" if args.one_way else ""}-{args.loss + "-dir" if args.dir else args.loss}-{str(args.batch_size)}-{str(args.lr)}-{str(args.epochs)}'
    
    logging.basicConfig(handlers=[
        logging.FileHandler(filename=os.path.join(weight_dir, "finetune.log"), encoding='utf-8', mode='w+'),
        logging.StreamHandler()],
        format="%(asctime)s: %(message)s", datefmt="%F %T", level=logging.INFO)
    
    logging.info(f'Finetuning: {weight_dir}')

    device = torch.device("cpu" if args.gpu == -1 or not torch.cuda.is_available() else f"cuda:{args.gpu}")

    logging.info(f'Loading Training Dataset')
    train_set = SimplePairClsDataset(pad_length=args.max_length, ftr2=True, gf=args.glob_feat, q_encoder=args.q_encoder, side_enc=args.side_enc, pcs=args.pcs, resize=args.resize)

    logging.info('Loading Test Dataset')
    if args.q_encoder in ['cnn', 'rn18']:
        test_set = PeptidePairPicDataset(mode='r2_case', pad_length=args.max_length, task=args.task, gf=args.glob_feat, side_enc=args.side_enc, pcs=args.pcs, resize=args.resize)
    else:
        test_set = PeptidePairDataset(mode='r2_case', pad_length=args.max_length, task=args.task, gf=args.glob_feat)

    train_loader = DataLoader(train_set, batch_size=args.batch_size, shuffle=True, drop_last=True, num_workers=8, pin_memory=True)
    test_loader = DataLoader(test_set, batch_size=args.batch_size, shuffle=False, num_workers=8, pin_memory=True)

    best_perform_list = [[] for i in range(5)]

    for fold in range(args.split):
        logging.info(f'Finetuning Fold {fold}')
        logging.info(f'Fold {fold}  Train set:{len(train_set)}, Test set: {len(test_set)}')
        # if args.widen:
        #     model = DMutaPeptideWiden(q_encoder=args.q_encoder, classes=args.classes, channels=args.channels, dir=args.dir, gf=args.glob_feat, fusion=args.fusion, side_enc=args.side_enc)
        # else:
        if args.q_encoder in ['cnn', 'rn18']:
            model = DMutaPeptideCNN(q_encoder=args.q_encoder, classes=args.classes, channels=args.channels, dir=args.dir, gf=args.glob_feat, side_enc=args.side_enc, fusion=args.fusion, non_siamese=args.non_siamese)
        else:
            model = DMutaPeptide(q_encoder=args.q_encoder, classes=args.classes, channels=args.channels, dir=args.dir, gf=args.glob_feat, fusion=args.fusion, non_siamese=args.non_siamese)

        weights_path = f"{weight_dir}/model_{fold}.pth"

        model.to(device)
        # model.load_state_dict(torch.load(weights_path.replace('.pth', '_test.pth'), map_location=device), strict=False)
        model.load_state_dict(torch.load(weights_path, map_location=device), strict=False)

        optimizer = torch.optim.AdamW(model.parameters(), lr=args.ft_lr)

        best_metric = -float('inf')

        if args.task == 'cls':
            for epoch in range(1, args.ft_epochs + 1):
                train_loss, ap, auc, f1, acc = train_cls(args, epoch, model, train_loader, test_loader, device, criterion, optimizer)
                logging.info(f'Epoch: {epoch:03d} Train Loss: {train_loss:.3f}, ap: {ap:.3f}, auc: {auc:.3f}, f1: {f1:.3f}, acc: {acc:.3f}')
                avg_metric = ap + auc #+ f1 + acc
                if avg_metric > best_metric:
                    logging.info(f'Epoch: {epoch:03d} New best VALIDATION metrics')
                    best_metric = avg_metric
                    best_perform_list[fold] = np.asarray([ap, auc, f1, acc])
                    torch.save(model.state_dict(), weights_path.replace('.pth', '_ft.pth'))



if __name__ == "__main__":
    main()