update v0.0.4

example/impls/__init__.py

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+# -*- coding: utf-8 -*-
+from . import dataset

example/impls/dataset/__init__.py

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+# -*- coding: utf-8 -*-
+from .classifier_dataset import ImageClassifyExampleDataset

example/impls/dataset/classifier_dataset.py

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+# -*- coding: utf-8 -*-
+# Copyright (c) Alibaba, Inc. and its affiliates.
+import numpy as np
+import torchvision
+
+from scepter.modules.data.dataset.base_dataset import BaseDataset
+from scepter.modules.data.dataset.registry import DATASETS
+from scepter.modules.utils.config import dict_to_yaml
+
+
+@DATASETS.register_class()
+class ImageClassifyExampleDataset(BaseDataset):
+    """
+    Dataset for image classification wrapper
+
+    Args:
+        json_path (str): json file which contains all instances, should be a list of dict
+            which contains img_path and gt_label
+        image_dir (str or None): image directory, if None, img_path in json_path will be considered as absolute path
+        classes (list[str] or None): image class description
+    """
+    para_dict = {
+        'DATASET': {
+            'value': 'cifar10',
+            'description': 'the public dataset name'
+        },
+        'DATA_ROOT': {
+            'value': '',
+            'description': 'the download data save path'
+        }
+    }
+
+    para_dict.update(BaseDataset.para_dict)
+
+    def __init__(self, cfg, logger=None):
+
+        super(ImageClassifyExampleDataset, self).__init__(cfg, logger=logger)
+
+        self.dataset_name = cfg.DATASET
+        self.data_root = cfg.DATA_ROOT
+        self.phase = cfg.MODE
+        if self.dataset_name == 'cifar10':
+            self.dataset = torchvision.datasets.CIFAR10(
+                root=self.data_root,
+                train=self.phase == 'train',
+                download=True)
+
+    def __len__(self) -> int:
+        return len(self.dataset)
+
+    def _get(self, index: int):
+        img, target = self.dataset.__getitem__(index)
+        ret = {
+            'meta': {},
+            'label': np.asarray(target, dtype=np.int64),
+            'img': img
+        }
+        return ret
+
+    def worker_init_fn(self, worker_id, num_workers=1):
+        super(ImageClassifyExampleDataset,
+              self).worker_init_fn(worker_id, num_workers=num_workers)
+
+    @staticmethod
+    def get_config_template():
+        '''
+        { "ENV" :
+            { "description" : "",
+              "A" : {
+                    "value": 1.0,
+                    "description": ""
+               }
+            }
+        }
+        :return:
+        '''
+        return dict_to_yaml('modename_DATA',
+                            __class__.__name__,
+                            ImageClassifyExampleDataset.para_dict,
+                            set_name=True)