engine_l2.py

"""
Train and eval functions used in main.py
"""
import math
import sys
from typing import Iterable, Optional

import torch

from timm.data import Mixup
from timm.utils import accuracy, ModelEma

from losses import DistillationLoss
import utils

import random
import gc

def train_one_epoch(model: torch.nn.Module, criterion: DistillationLoss,
                    data_loader: Iterable, optimizer: torch.optim.Optimizer,
                    device: torch.device, epoch: int, loss_scaler, max_norm: float = 0,
                    model_ema: Optional[ModelEma] = None, mixup_fn: Optional[Mixup] = None,
                    set_training_mode=True):
    model.train(set_training_mode)
    metric_logger = utils.MetricLogger(delimiter="  ")
    metric_logger.add_meter('lr', utils.SmoothedValue(window_size=1, fmt='{value:.6f}'))
    header = 'Epoch: [{}]'.format(epoch)
    print_freq = 10
    #i = 0

    for samples, targets in metric_logger.log_every(data_loader, print_freq, header):

        samples = samples.to(device, non_blocking=True)
        targets = targets.to(device, non_blocking=True)

        if mixup_fn is not None:
            samples, targets = mixup_fn(samples, targets)
        with torch.cuda.amp.autocast(enabled=False):
            outputs = model(samples)

            loss = criterion(samples, outputs, targets)
 
        loss_value = loss.item()

        if not math.isfinite(loss_value):
            print("Loss is {}, stopping training".format(loss_value))
            sys.exit(1)

        optimizer.zero_grad()

        # this attribute is added by timm on one optimizer (adahessian)
        is_second_order = hasattr(optimizer, 'is_second_order') and optimizer.is_second_order
        loss_scaler(loss, optimizer, clip_grad=max_norm,
                        parameters=model.parameters(), create_graph=is_second_order)
    
        torch.cuda.synchronize()
        if model_ema is not None:
            model_ema.update(model)

        #i+=1
        #
        #if i > 20: break

        metric_logger.update(loss=loss_value)
        metric_logger.update(lr=optimizer.param_groups[0]["lr"])
    # gather the stats from all processes
    metric_logger.synchronize_between_processes()
    print("Averaged stats:", metric_logger)
    return {k: meter.global_avg for k, meter in metric_logger.meters.items()}


@torch.no_grad()
def evaluate(data_loader, model, device):
    criterion = torch.nn.CrossEntropyLoss()

    metric_logger = utils.MetricLogger(delimiter="  ")
    header = 'Test:'

    # switch to evaluation mode
    model.eval()
    zero_0 = 0
    unzero_0 = 0
    zero_1 = 0
    unzero_1 = 0
    zero_2 = 0
    unzero_2 = 0

    for images, target in metric_logger.log_every(data_loader, 10, header):
        images = images.to(device, non_blocking=True)
        target = target.to(device, non_blocking=True)

        # compute output
        with torch.cuda.amp.autocast(enabled=False):
            output_all = model(images)
            output, sparse = output_all
            loss = criterion(output, target)

        acc1, acc5 = accuracy(output, target, topk=(1, 5))
        sparse=sparse.tolist()
        zero_0 +=sparse[0][0]
        unzero_0 +=sparse[0][1]
        zero_1 +=sparse[1][0]
        unzero_1 +=sparse[1][1]
        zero_2 +=sparse[2][0]
        unzero_2 +=sparse[2][1]


        batch_size = images.shape[0]
        metric_logger.update(loss=loss.item())
        metric_logger.meters['acc1'].update(acc1.item(), n=batch_size)
        metric_logger.meters['acc5'].update(acc5.item(), n=batch_size)
    # gather the stats from all processes
    metric_logger.synchronize_between_processes()

    print('Sparsity0:{},Sparsity1:{},Sparsity2:{},'.format(zero_0/(zero_0+unzero_0),zero_1/(zero_1+unzero_1),zero_2/(zero_2+unzero_2)))
    print('* Acc@1 {top1.global_avg:.3f} Acc@5 {top5.global_avg:.3f} loss {losses.global_avg:.3f}'
          .format(top1=metric_logger.acc1, top5=metric_logger.acc5, losses=metric_logger.loss))

    return {k: meter.global_avg for k, meter in metric_logger.meters.items()}