(self, data_source, num_instances)
| 18 | |
| 19 | class RandomIdentitySampler(Sampler): |
| 20 | def __init__(self, data_source, num_instances): |
| 21 | self.data_source = data_source |
| 22 | self.num_instances = num_instances |
| 23 | self.index_dic = defaultdict(list) |
| 24 | for index, (_, pid, _) in enumerate(data_source): |
| 25 | self.index_dic[pid].append(index) |
| 26 | self.pids = list(self.index_dic.keys()) |
| 27 | self.num_samples = len(self.pids) |
| 28 | |
| 29 | def __len__(self): |
| 30 | return self.num_samples * self.num_instances |