| import io |
| import math |
| import random |
| import os |
| import cv2 |
| import lmdb |
| import numpy as np |
| from PIL import Image |
| from torch.utils.data import Dataset |
|
|
| from openrec.preprocess import create_operators, transform |
|
|
|
|
| class RatioDataSet(Dataset): |
|
|
| def __init__(self, config, mode, logger, seed=None, epoch=1, task='rec'): |
| super(RatioDataSet, self).__init__() |
| self.ds_width = config[mode]['dataset'].get('ds_width', True) |
| global_config = config['Global'] |
| dataset_config = config[mode]['dataset'] |
| loader_config = config[mode]['loader'] |
| max_ratio = loader_config.get('max_ratio', 10) |
| min_ratio = loader_config.get('min_ratio', 1) |
| syn = dataset_config.get('syn', False) |
| if syn: |
| data_dir_list = [] |
| data_dir = '../training_aug_lmdb_noerror/ep' + str(epoch) |
| for dir_syn in os.listdir(data_dir): |
| data_dir_list.append(data_dir + '/' + dir_syn) |
| else: |
| data_dir_list = dataset_config['data_dir_list'] |
| self.padding = dataset_config.get('padding', True) |
| self.padding_rand = dataset_config.get('padding_rand', False) |
| self.padding_doub = dataset_config.get('padding_doub', False) |
| self.do_shuffle = loader_config['shuffle'] |
| self.seed = epoch |
| data_source_num = len(data_dir_list) |
| ratio_list = dataset_config.get('ratio_list', 1.0) |
| if isinstance(ratio_list, (float, int)): |
| ratio_list = [float(ratio_list)] * int(data_source_num) |
| assert ( |
| len(ratio_list) == data_source_num |
| ), 'The length of ratio_list should be the same as the file_list.' |
| self.lmdb_sets = self.load_hierarchical_lmdb_dataset( |
| data_dir_list, ratio_list) |
| for data_dir in data_dir_list: |
| logger.info('Initialize indexs of datasets:%s' % data_dir) |
| self.logger = logger |
| self.data_idx_order_list = self.dataset_traversal() |
| wh_ratio = np.around(np.array(self.get_wh_ratio())) |
| self.wh_ratio = np.clip(wh_ratio, a_min=min_ratio, a_max=max_ratio) |
| for i in range(max_ratio + 1): |
| logger.info((1 * (self.wh_ratio == i)).sum()) |
| self.wh_ratio_sort = np.argsort(self.wh_ratio) |
| self.ops = create_operators(dataset_config['transforms'], |
| global_config) |
|
|
| self.need_reset = True in [x < 1 for x in ratio_list] |
| self.error = 0 |
| self.base_shape = dataset_config.get( |
| 'base_shape', [[64, 64], [96, 48], [112, 40], [128, 32]]) |
| self.base_h = 32 |
|
|
| def get_wh_ratio(self): |
| wh_ratio = [] |
| for idx in range(self.data_idx_order_list.shape[0]): |
| lmdb_idx, file_idx = self.data_idx_order_list[idx] |
| lmdb_idx = int(lmdb_idx) |
| file_idx = int(file_idx) |
| wh_key = 'wh-%09d'.encode() % file_idx |
| wh = self.lmdb_sets[lmdb_idx]['txn'].get(wh_key) |
| if wh is None: |
| img_key = f'image-{file_idx:09d}'.encode() |
| img = self.lmdb_sets[lmdb_idx]['txn'].get(img_key) |
| buf = io.BytesIO(img) |
| w, h = Image.open(buf).size |
| else: |
| wh = wh.decode('utf-8') |
| w, h = wh.split('_') |
| wh_ratio.append(float(w) / float(h)) |
| return wh_ratio |
|
|
| def load_hierarchical_lmdb_dataset(self, data_dir_list, ratio_list): |
| lmdb_sets = {} |
| dataset_idx = 0 |
| for dirpath, ratio in zip(data_dir_list, ratio_list): |
| env = lmdb.open(dirpath, |
| max_readers=32, |
| readonly=True, |
| lock=False, |
| readahead=False, |
| meminit=False) |
| txn = env.begin(write=False) |
| num_samples = int(txn.get('num-samples'.encode())) |
| lmdb_sets[dataset_idx] = { |
| 'dirpath': dirpath, |
| 'env': env, |
| 'txn': txn, |
| 'num_samples': num_samples, |
| 'ratio_num_samples': int(ratio * num_samples) |
| } |
| dataset_idx += 1 |
| return lmdb_sets |
|
|
| def dataset_traversal(self): |
| lmdb_num = len(self.lmdb_sets) |
| total_sample_num = 0 |
| for lno in range(lmdb_num): |
| total_sample_num += self.lmdb_sets[lno]['ratio_num_samples'] |
| data_idx_order_list = np.zeros((total_sample_num, 2)) |
| beg_idx = 0 |
| for lno in range(lmdb_num): |
| tmp_sample_num = self.lmdb_sets[lno]['ratio_num_samples'] |
| end_idx = beg_idx + tmp_sample_num |
| data_idx_order_list[beg_idx:end_idx, 0] = lno |
| data_idx_order_list[beg_idx:end_idx, 1] = list( |
| random.sample(range(1, self.lmdb_sets[lno]['num_samples'] + 1), |
| self.lmdb_sets[lno]['ratio_num_samples'])) |
| beg_idx = beg_idx + tmp_sample_num |
| return data_idx_order_list |
|
|
| def get_img_data(self, value): |
| """get_img_data.""" |
| if not value: |
| return None |
| imgdata = np.frombuffer(value, dtype='uint8') |
| if imgdata is None: |
| return None |
| imgori = cv2.imdecode(imgdata, 1) |
| if imgori is None: |
| return None |
| return imgori |
|
|
| def resize_norm_img(self, data, gen_ratio, padding=True): |
| img = data['image'] |
| h = img.shape[0] |
| w = img.shape[1] |
| if self.padding_rand and random.random() < 0.5: |
| padding = not padding |
| imgW, imgH = self.base_shape[gen_ratio - 1] if gen_ratio <= 4 else [ |
| self.base_h * gen_ratio, self.base_h |
| ] |
| use_ratio = imgW // imgH |
| if use_ratio >= (w // h) + 2: |
| self.error += 1 |
| return None |
| if not padding: |
| resized_image = cv2.resize(img, (imgW, imgH), |
| interpolation=cv2.INTER_LINEAR) |
| resized_w = imgW |
| else: |
| ratio = w / float(h) |
| if math.ceil(imgH * ratio) > imgW: |
| resized_w = imgW |
| else: |
| resized_w = int( |
| math.ceil(imgH * ratio * (random.random() + 0.5))) |
| resized_w = min(imgW, resized_w) |
|
|
| resized_image = cv2.resize(img, (resized_w, imgH)) |
| resized_image = resized_image.astype('float32') |
| resized_image = resized_image.transpose((2, 0, 1)) / 255 |
| resized_image -= 0.5 |
| resized_image /= 0.5 |
| padding_im = np.zeros((3, imgH, imgW), dtype=np.float32) |
| if self.padding_doub and random.random() < 0.5: |
| padding_im[:, :, -resized_w:] = resized_image |
| else: |
| padding_im[:, :, :resized_w] = resized_image |
| valid_ratio = min(1.0, float(resized_w / imgW)) |
| data['image'] = padding_im |
| data['valid_ratio'] = valid_ratio |
| data['real_ratio'] = round(w / h) |
| return data |
|
|
| def get_lmdb_sample_info(self, txn, index): |
| label_key = 'label-%09d'.encode() % index |
| label = txn.get(label_key) |
| if label is None: |
| return None |
| label = label.decode('utf-8') |
| img_key = 'image-%09d'.encode() % index |
| imgbuf = txn.get(img_key) |
| return imgbuf, label |
|
|
| def __getitem__(self, properties): |
| img_width = properties[0] |
| img_height = properties[1] |
| idx = properties[2] |
| ratio = properties[3] |
| lmdb_idx, file_idx = self.data_idx_order_list[idx] |
| lmdb_idx = int(lmdb_idx) |
| file_idx = int(file_idx) |
| sample_info = self.get_lmdb_sample_info( |
| self.lmdb_sets[lmdb_idx]['txn'], file_idx) |
| if sample_info is None: |
| ratio_ids = np.where(self.wh_ratio == ratio)[0].tolist() |
| ids = random.sample(ratio_ids, 1) |
| return self.__getitem__([img_width, img_height, ids[0], ratio]) |
| img, label = sample_info |
| data = {'image': img, 'label': label} |
| outs = transform(data, self.ops[:-1]) |
| if outs is not None: |
| outs = self.resize_norm_img(outs, ratio, padding=self.padding) |
| if outs is None: |
| ratio_ids = np.where(self.wh_ratio == ratio)[0].tolist() |
| ids = random.sample(ratio_ids, 1) |
| return self.__getitem__([img_width, img_height, ids[0], ratio]) |
| outs = transform(outs, self.ops[-1:]) |
| if outs is None: |
| ratio_ids = np.where(self.wh_ratio == ratio)[0].tolist() |
| ids = random.sample(ratio_ids, 1) |
| return self.__getitem__([img_width, img_height, ids[0], ratio]) |
| return outs |
|
|
| def __len__(self): |
| return self.data_idx_order_list.shape[0] |
|
|
