io_utils.py

import numpy as np
import os
import glob
import argparse
import backbone
import torch
import random

model_dict = dict(
            Conv4 = backbone.Conv4,
            Conv6 = backbone.Conv6,
            ResNet10 = backbone.ResNet10,
            ResNet18 = backbone.ResNet18,
            ResNet34 = backbone.ResNet34,
            ResNet50 = backbone.ResNet50,
            ResNet101 = backbone.ResNet101)



def parse_args(script):
    parser = argparse.ArgumentParser(description= 'few-shot script %s' %(script))
    parser.add_argument('--dataset'     , default='BreaKHis_40x',        help='BreaKHis_40x, ISIC, Smear, cross_IDC')
    parser.add_argument('--model'       , default='ResNet10',      help='model: Conv{4|6} / ResNet{10|18|34|50|101}') # 50 and 101 are not used in the paper
    parser.add_argument('--method'      , default='baseline',   help='baseline/baseline++/protonet/matchingnet/relationnet{_softmax}/maml{_approx}/tra_maml') #relationnet_softmax replace L2 norm with softmax to expedite training, maml_approx use first-order approximation in the gradient for efficiency
    parser.add_argument('--train_n_way' , default=3, type=int,  help='class num to classify for training') #baseline and baseline++ would ignore this parameter
    parser.add_argument('--test_n_way'  , default=3, type=int,  help='class num to classify for testing (validation) ') #baseline and baseline++ only use this parameter in finetuning
    parser.add_argument('--n_shot'      , default=1, type=int,  help='number of labeled data in each class, same as n_support') #baseline and baseline++ only use this parameter in finetuning
    parser.add_argument('--train_aug'   , default='none', type=str, help='perform data augmentation or not during training, aug: none, standard') #still required for save_features.py and test.py to find the model path correctly
    parser.add_argument('--tra'   , default='none', type=str, help='TRA configurations: min_step-max_step-width')


    if script == 'train':
        parser.add_argument('--num_classes' , default=6, type=int, help='total number of classes in softmax, only used in baseline') #make it larger than the maximum label value in base class
        parser.add_argument('--save_freq'   , default=20, type=int, help='Save frequency')
        parser.add_argument('--optimizer'   , default='Adam', type=str, help='Optimizer for training, Adam or Ranger')
        parser.add_argument('--loss_func'   , default='cross_entropy', type=str, help='Type of loss')
        parser.add_argument('--start_epoch' , default=0, type=int,help ='Starting epoch')
        parser.add_argument('--stop_epoch'  , default=-1, type=int, help ='Stopping epoch') #for meta-learning methods, each epoch contains 100 episodes. The default epoch number is dataset dependent. See train.py
        parser.add_argument('--resume'      , action='store_true', help='continue from previous trained model with largest epoch')

    elif script == 'save_features':
        parser.add_argument('--split'       , default='novel', help='base/val/novel') #default novel, but you can also test base/val class accuracy if you want 
        parser.add_argument('--save_iter', default=-1, type=int,help ='save feature from the model trained in x epoch, use the best model if x is -1')
    elif script == 'test':
        parser.add_argument('--split'       , default='novel', help='base/val/novel') #default novel, but you can also test base/val class accuracy if you want 
        parser.add_argument('--save_iter', default=-1, type=int,help ='saved feature from the model trained in x epoch, use the best model if x is -1')
        parser.add_argument('--adaptation'  , action='store_true', help='further adaptation in test time or not')

    else:
       raise ValueError('Unknown script')
        

    return parser.parse_args()


def get_assigned_file(checkpoint_dir,num):
    assign_file = os.path.join(checkpoint_dir, '{:d}.tar'.format(num))
    return assign_file

def get_resume_file(checkpoint_dir):
    filelist = glob.glob(os.path.join(checkpoint_dir, '*.tar'))
    if len(filelist) == 0:
        return None

    filelist =  [ x  for x in filelist if os.path.basename(x) != 'best_model.tar' ]
    epochs = np.array([int(os.path.splitext(os.path.basename(x))[0]) for x in filelist])
    max_epoch = np.max(epochs)
    resume_file = os.path.join(checkpoint_dir, '{:d}.tar'.format(max_epoch))
    return resume_file

def get_best_file(checkpoint_dir):    
    best_file = os.path.join(checkpoint_dir, 'best_model.tar')
    if os.path.isfile(best_file):
        return best_file
    else:
        return get_resume_file(checkpoint_dir)

def set_seed(seed=10):
            random.seed(seed)
            os.environ['PYTHONHASHSEED'] = str(seed)
            np.random.seed(seed)
            torch.manual_seed(seed)
            torch.cuda.manual_seed(seed)
            torch.cuda.manual_seed_all(seed)
            torch.backends.cudnn.benchmark = False
            torch.backends.cudnn.deterministic = True