diff --git a/fastreid/data/build.py b/fastreid/data/build.py
index 92202b2..a073f94 100644
--- a/fastreid/data/build.py
+++ b/fastreid/data/build.py
@@ -54,6 +54,7 @@ def build_reid_train_loader(cfg):
         num_workers=num_workers,
         batch_sampler=batch_sampler,
         collate_fn=fast_batch_collator,
+        pin_memory=True,
     )
     return train_loader
 
@@ -61,7 +62,7 @@ def build_reid_train_loader(cfg):
 def build_reid_test_loader(cfg, dataset_name):
     cfg = cfg.clone()
     cfg.defrost()
-    
+
     dataset = DATASET_REGISTRY.get(dataset_name)(root=_root)
     if comm.is_main_process():
         dataset.show_test()
@@ -77,7 +78,9 @@ def build_reid_test_loader(cfg, dataset_name):
         test_set,
         batch_sampler=batch_sampler,
         num_workers=0,  # save some memory
-        collate_fn=fast_batch_collator)
+        collate_fn=fast_batch_collator,
+        pin_memory=True,
+    )
     return test_loader, len(dataset.query)
 
 
diff --git a/fastreid/data/common.py b/fastreid/data/common.py
index 959fefb..82feb3b 100644
--- a/fastreid/data/common.py
+++ b/fastreid/data/common.py
@@ -17,10 +17,17 @@ class CommDataset(Dataset):
         self.transform = transform
         self.relabel = relabel
 
-        pid_set = set([i[1] for i in img_items])
+        pid_set = set()
+        cam_set = set()
+        for i in img_items:
+            pid_set.add(i[1])
+            cam_set.add(i[2])
 
         self.pids = sorted(list(pid_set))
-        if relabel: self.pid_dict = dict([(p, i) for i, p in enumerate(self.pids)])
+        self.cams = sorted(list(cam_set))
+        if relabel:
+            self.pid_dict = dict([(p, i) for i, p in enumerate(self.pids)])
+            self.cam_dict = dict([(p, i) for i, p in enumerate(self.cams)])
 
     def __len__(self):
         return len(self.img_items)
@@ -29,14 +36,20 @@ class CommDataset(Dataset):
         img_path, pid, camid = self.img_items[index]
         img = read_image(img_path)
         if self.transform is not None: img = self.transform(img)
-        if self.relabel: pid = self.pid_dict[pid]
+        if self.relabel:
+            pid = self.pid_dict[pid]
+            camid = self.cam_dict[camid]
         return {
             "images": img,
             "targets": pid,
-            "camid": camid,
-            "img_path": img_path
+            "camids": camid,
+            "img_paths": img_path,
         }
 
     @property
     def num_classes(self):
         return len(self.pids)
+
+    @property
+    def num_cameras(self):
+        return len(self.cams)
diff --git a/fastreid/data/datasets/AirportALERT.py b/fastreid/data/datasets/AirportALERT.py
new file mode 100644
index 0000000..0ffece6
--- /dev/null
+++ b/fastreid/data/datasets/AirportALERT.py
@@ -0,0 +1,46 @@
+# encoding: utf-8
+"""
+@author:  xingyu liao
+@contact: sherlockliao01@gmail.com
+"""
+
+import os
+
+from fastreid.data.datasets import DATASET_REGISTRY
+from fastreid.data.datasets.bases import ImageDataset
+
+__all__ = ['AirportALERT', ]
+
+
+@DATASET_REGISTRY.register()
+class AirportALERT(ImageDataset):
+    dataset_dir = "AirportALERT"
+    dataset_name = "airport"
+
+    def __init__(self, root='datasets', **kwargs):
+        self.root = root
+        self.train_path = os.path.join(self.root, self.dataset_dir)
+        self.train_file = os.path.join(self.root, self.dataset_dir, 'filepath.txt')
+
+        required_files = [self.train_file, self.train_path]
+        self.check_before_run(required_files)
+
+        train = self.process_train(self.train_path, self.train_file)
+
+        super().__init__(train, [], [], **kwargs)
+
+    def process_train(self, dir_path, train_file):
+        data = []
+        with open(train_file, "r") as f:
+            img_paths = [line.strip('\n') for line in f.readlines()]
+
+        for path in img_paths:
+            split_path = path.split('\\')
+            img_path = '/'.join(split_path)
+            camid = self.dataset_name + "_" + split_path[0]
+            pid = self.dataset_name + "_" + split_path[1]
+            img_path = os.path.join(dir_path, img_path)
+            if 11001 <= int(split_path[1]) <= 401999:
+                data.append([img_path, pid, camid])
+
+        return data
diff --git a/fastreid/data/datasets/__init__.py b/fastreid/data/datasets/__init__.py
index 8518cb9..80e7467 100644
--- a/fastreid/data/datasets/__init__.py
+++ b/fastreid/data/datasets/__init__.py
@@ -12,10 +12,24 @@ Registry for datasets
 It must returns an instance of :class:`Backbone`.
 """
 
+# Person re-id datasets
 from .cuhk03 import CUHK03
 from .dukemtmcreid import DukeMTMC
 from .market1501 import Market1501
 from .msmt17 import MSMT17
+from .AirportALERT import AirportALERT
+from .iLIDS import iLIDS
+from .pku import PKU
+from .prai import PRAI
+from .sensereid import SenseReID
+from .sysu_mm import SYSU_mm
+from .thermalworld import Thermalworld
+from .pes3d import PeS3D
+from .caviara import CAVIARa
+from .viper import VIPeR
+from .lpw import LPW
+from .shinpuhkan import Shinpuhkan
+# Vehicle re-id datasets
 from .veri import VeRi
 from .vehicleid import VehicleID, SmallVehicleID, MediumVehicleID, LargeVehicleID
 from .veriwild import VeRiWild, SmallVeRiWild, MediumVeRiWild, LargeVeRiWild
diff --git a/fastreid/data/datasets/caviara.py b/fastreid/data/datasets/caviara.py
new file mode 100644
index 0000000..9403671
--- /dev/null
+++ b/fastreid/data/datasets/caviara.py
@@ -0,0 +1,46 @@
+# encoding: utf-8
+"""
+@author:  xingyu liao
+@contact: sherlockliao01@gmail.com
+"""
+
+import os
+from scipy.io import loadmat
+from glob import glob
+
+from fastreid.data.datasets import DATASET_REGISTRY
+from fastreid.data.datasets.bases import ImageDataset
+import pdb
+import random
+import numpy as np
+
+__all__ = ['CAVIARa',]
+
+
+@DATASET_REGISTRY.register()
+class CAVIARa(ImageDataset):
+    dataset_dir = "CAVIARa"
+    dataset_name = "caviara"
+
+    def __init__(self, root='datasets', **kwargs):
+        self.root = root
+        self.train_path = os.path.join(self.root, self.dataset_dir)
+
+        required_files = [self.train_path]
+        self.check_before_run(required_files)
+
+        train = self.process_train(self.train_path)
+
+        super().__init__(train, [], [], **kwargs)
+
+    def process_train(self, train_path):
+        data = []
+
+        img_list = glob(os.path.join(train_path, "*.jpg"))
+        for img_path in img_list:
+            img_name = img_path.split('/')[-1]
+            pid = self.dataset_name + "_" + img_name[:4]
+            camid = self.dataset_name + "_cam0"
+            data.append([img_path, pid, camid])
+
+        return data
diff --git a/fastreid/data/datasets/cuhk03.py b/fastreid/data/datasets/cuhk03.py
index 5c92fc8..96fdaa5 100644
--- a/fastreid/data/datasets/cuhk03.py
+++ b/fastreid/data/datasets/cuhk03.py
@@ -76,7 +76,8 @@ class CUHK03(ImageDataset):
         tmp_train = []
         for img_path, pid, camid in train:
             new_pid = self.dataset_name + "_" + str(pid)
-            tmp_train.append((img_path, new_pid, camid))
+            new_camid = self.dataset_name + "_" + str(camid)
+            tmp_train.append((img_path, new_pid, new_camid))
         train = tmp_train
         del tmp_train
         query = split['query']
diff --git a/fastreid/data/datasets/dukemtmcreid.py b/fastreid/data/datasets/dukemtmcreid.py
index 6e83d80..cd90ce2 100644
--- a/fastreid/data/datasets/dukemtmcreid.py
+++ b/fastreid/data/datasets/dukemtmcreid.py
@@ -64,6 +64,7 @@ class DukeMTMC(ImageDataset):
             camid -= 1  # index starts from 0
             if is_train:
                 pid = self.dataset_name + "_" + str(pid)
+                camid = self.dataset_name + "_" + str(camid)
             data.append((img_path, pid, camid))
 
         return data
diff --git a/fastreid/data/datasets/iLIDS.py b/fastreid/data/datasets/iLIDS.py
new file mode 100644
index 0000000..9d9a412
--- /dev/null
+++ b/fastreid/data/datasets/iLIDS.py
@@ -0,0 +1,43 @@
+# encoding: utf-8
+"""
+@author:  xingyu liao
+@contact: sherlockliao01@gmail.com
+"""
+
+import os
+from glob import glob
+
+from fastreid.data.datasets import DATASET_REGISTRY
+from fastreid.data.datasets.bases import ImageDataset
+
+__all__ = ['iLIDS', ]
+
+
+@DATASET_REGISTRY.register()
+class iLIDS(ImageDataset):
+    dataset_dir = "iLIDS"
+    dataset_name = "ilids"
+
+    def __init__(self, root='datasets', **kwargs):
+        self.root = root
+        self.train_path = os.path.join(self.root, self.dataset_dir)
+
+        required_files = [self.train_path]
+        self.check_before_run(required_files)
+
+        train = self.process_train(self.train_path)
+
+        super().__init__(train, [], [], **kwargs)
+
+    def process_train(self, train_path):
+        data = []
+        file_path = os.listdir(train_path)
+        for pid_dir in file_path:
+            img_file = os.path.join(train_path, pid_dir)
+            img_paths = glob(os.path.join(img_file, "*.png"))
+            for img_path in img_paths:
+                split_path = img_path.split('/')
+                pid = self.dataset_name + "_" + split_path[-2]
+                camid = self.dataset_name + "_" + split_path[-1].split('_')[0]
+                data.append([img_path, pid, camid])
+        return data
diff --git a/fastreid/data/datasets/lpw.py b/fastreid/data/datasets/lpw.py
new file mode 100644
index 0000000..a7f6117
--- /dev/null
+++ b/fastreid/data/datasets/lpw.py
@@ -0,0 +1,47 @@
+# encoding: utf-8
+"""
+@author:  xingyu liao
+@contact: sherlockliao01@gmail.com
+"""
+
+import os
+from glob import glob
+
+from fastreid.data.datasets import DATASET_REGISTRY
+from fastreid.data.datasets.bases import ImageDataset
+
+__all__ = ['LPW', ]
+
+
+@DATASET_REGISTRY.register()
+class LPW(ImageDataset):
+    dataset_dir = "pep_256x128"
+    dataset_name = "lpw"
+
+    def __init__(self, root='datasets', **kwargs):
+        self.root = root
+        self.train_path = os.path.join(self.root, self.dataset_dir)
+
+        required_files = [self.train_path]
+        self.check_before_run(required_files)
+
+        train = self.process_train(self.train_path)
+
+        super().__init__(train, [], [], **kwargs)
+
+    def process_train(self, train_path):
+        data = []
+
+        file_path_list = ['scen1', 'scen2', 'scen3']
+
+        for scene in file_path_list:
+            cam_list = os.listdir(os.path.join(train_path, scene))
+            for cam in cam_list:
+                camid = self.dataset_name + "_" + cam
+                pid_list = os.listdir(os.path.join(train_path, scene, cam))
+                for pid_dir in pid_list:
+                    img_paths = glob(os.path.join(train_path, scene, cam, pid_dir, "*.jpg"))
+                    for img_path in img_paths:
+                        pid = self.dataset_name + "_" + scene + "-" + pid_dir
+                        data.append([img_path, pid, camid])
+        return data
diff --git a/fastreid/data/datasets/market1501.py b/fastreid/data/datasets/market1501.py
index 9460533..d1968af 100644
--- a/fastreid/data/datasets/market1501.py
+++ b/fastreid/data/datasets/market1501.py
@@ -84,6 +84,7 @@ class Market1501(ImageDataset):
             camid -= 1  # index starts from 0
             if is_train:
                 pid = self.dataset_name + "_" + str(pid)
+                camid = self.dataset_name + "_" + str(camid)
             data.append((img_path, pid, camid))
 
         return data
diff --git a/fastreid/data/datasets/msmt17.py b/fastreid/data/datasets/msmt17.py
index 85ea9be..3d77d2b 100644
--- a/fastreid/data/datasets/msmt17.py
+++ b/fastreid/data/datasets/msmt17.py
@@ -108,6 +108,7 @@ class MSMT17(ImageDataset):
             img_path = osp.join(dir_path, img_path)
             if is_train:
                 pid = self.dataset_name + "_" + str(pid)
+                camid = self.dataset_name + "_" + str(camid)
             data.append((img_path, pid, camid))
 
         return data
diff --git a/fastreid/data/datasets/pes3d.py b/fastreid/data/datasets/pes3d.py
new file mode 100644
index 0000000..4b4897e
--- /dev/null
+++ b/fastreid/data/datasets/pes3d.py
@@ -0,0 +1,46 @@
+# encoding: utf-8
+"""
+@author:  xingyu liao
+@contact: sherlockliao01@gmail.com
+"""
+
+import os
+from scipy.io import loadmat
+from glob import glob
+
+from fastreid.data.datasets import DATASET_REGISTRY
+from fastreid.data.datasets.bases import ImageDataset
+import pdb
+import random
+import numpy as np
+
+__all__ = ['PeS3D',]
+
+
+@DATASET_REGISTRY.register()
+class PeS3D(ImageDataset):
+    dataset_dir = "3DPeS"
+    dataset_name = "pes3d"
+
+    def __init__(self, root='datasets', **kwargs):
+        self.root = root
+        self.train_path = os.path.join(self.root, self.dataset_dir)
+
+        required_files = [self.train_path]
+        self.check_before_run(required_files)
+
+        train = self.process_train(self.train_path)
+
+        super().__init__(train, [], [], **kwargs)
+
+    def process_train(self, train_path):
+        data = []
+
+        pid_list = os.listdir(train_path)
+        for pid_dir in pid_list:
+            pid = self.dataset_name + "_" + pid_dir
+            img_list = glob(os.path.join(train_path, pid_dir,  "*.bmp"))
+            for img_path in img_list:
+                camid = self.dataset_name + "_cam0"
+                data.append([img_path, pid, camid])
+        return data
diff --git a/fastreid/data/datasets/pku.py b/fastreid/data/datasets/pku.py
new file mode 100644
index 0000000..0082d29
--- /dev/null
+++ b/fastreid/data/datasets/pku.py
@@ -0,0 +1,42 @@
+# encoding: utf-8
+"""
+@author:  xingyu liao
+@contact: sherlockliao01@gmail.com
+"""
+
+import os
+from glob import glob
+
+from fastreid.data.datasets import DATASET_REGISTRY
+from fastreid.data.datasets.bases import ImageDataset
+
+__all__ = ['PKU', ]
+
+
+@DATASET_REGISTRY.register()
+class PKU(ImageDataset):
+    dataset_dir = "PKUv1a_128x48"
+    dataset_name = 'pku'
+
+    def __init__(self, root='datasets', **kwargs):
+        self.root = root
+        self.train_path = os.path.join(self.root, self.dataset_dir)
+
+        required_files = [self.train_path]
+        self.check_before_run(required_files)
+
+        train = self.process_train(self.train_path)
+
+        super().__init__(train, [], [], **kwargs)
+
+    def process_train(self, train_path):
+        data = []
+        img_paths = glob(os.path.join(train_path, "*.png"))
+
+        for img_path in img_paths:
+            split_path = img_path.split('/')
+            img_info = split_path[-1].split('_')
+            pid = self.dataset_name + "_" + img_info[0]
+            camid = self.dataset_name + "_" + img_info[1]
+            data.append([img_path, pid, camid])
+        return data
diff --git a/fastreid/data/datasets/prai.py b/fastreid/data/datasets/prai.py
new file mode 100644
index 0000000..42a0223
--- /dev/null
+++ b/fastreid/data/datasets/prai.py
@@ -0,0 +1,44 @@
+# encoding: utf-8
+"""
+@author:  xingyu liao
+@contact: sherlockliao01@gmail.com
+"""
+
+import os
+from scipy.io import loadmat
+from glob import glob
+
+from fastreid.data.datasets import DATASET_REGISTRY
+from fastreid.data.datasets.bases import ImageDataset
+import pdb
+
+__all__ = ['PRAI',]
+
+
+@DATASET_REGISTRY.register()
+class PRAI(ImageDataset):
+    dataset_dir = "PRAI-1581"
+    dataset_name = 'prai'
+
+    def __init__(self, root='datasets', **kwargs):
+        self.root = root
+        self.train_path = os.path.join(self.root, self.dataset_dir, 'images')
+
+        required_files = [self.train_path]
+        self.check_before_run(required_files)
+
+        train = self.process_train(self.train_path)
+
+        super().__init__(train, [], [], **kwargs)
+
+    def process_train(self, train_path):
+        data = []
+        img_paths = glob(os.path.join(train_path, "*.jpg"))
+        for img_path in img_paths:
+            split_path = img_path.split('/')
+            img_info = split_path[-1].split('_')
+            pid = self.dataset_name + "_" + img_info[0]
+            camid = self.dataset_name + "_" + img_info[1]
+            data.append([img_path, pid, camid])
+        return data
+
diff --git a/fastreid/data/datasets/sensereid.py b/fastreid/data/datasets/sensereid.py
new file mode 100644
index 0000000..92d2c16
--- /dev/null
+++ b/fastreid/data/datasets/sensereid.py
@@ -0,0 +1,45 @@
+# encoding: utf-8
+"""
+@author:  xingyu liao
+@contact: sherlockliao01@gmail.com
+"""
+
+import os
+from glob import glob
+
+from fastreid.data.datasets import DATASET_REGISTRY
+from fastreid.data.datasets.bases import ImageDataset
+
+__all__ = ['SenseReID', ]
+
+
+@DATASET_REGISTRY.register()
+class SenseReID(ImageDataset):
+    dataset_dir = "SenseReID"
+    dataset_name = "senseid"
+
+    def __init__(self, root='datasets', **kwargs):
+        self.root = root
+        self.train_path = os.path.join(self.root, self.dataset_dir)
+
+        required_files = [self.train_path]
+        self.check_before_run(required_files)
+
+        train = self.process_train(self.train_path)
+
+        super().__init__(train, [], [], **kwargs)
+
+    def process_train(self, train_path):
+        data = []
+        file_path_list = ['test_gallery', 'test_prob']
+
+        for file_path in file_path_list:
+            sub_file = os.path.join(train_path, file_path)
+            img_name = glob(os.path.join(sub_file, "*.jpg"))
+            for img_path in img_name:
+                img_name = img_path.split('/')[-1]
+                img_info = img_name.split('_')
+                pid = self.dataset_name + "_" + img_info[0]
+                camid = self.dataset_name + "_" + img_info[1].split('.')[0]
+                data.append([img_path, pid, camid])
+        return data
diff --git a/fastreid/data/datasets/shinpuhkan.py b/fastreid/data/datasets/shinpuhkan.py
new file mode 100644
index 0000000..ae240c1
--- /dev/null
+++ b/fastreid/data/datasets/shinpuhkan.py
@@ -0,0 +1,46 @@
+# encoding: utf-8
+"""
+@author:  xingyu liao
+@contact: sherlockliao01@gmail.com
+"""
+
+import os
+
+from fastreid.data.datasets import DATASET_REGISTRY
+from fastreid.data.datasets.bases import ImageDataset
+
+__all__ = ['Shinpuhkan', ]
+
+
+@DATASET_REGISTRY.register()
+class Shinpuhkan(ImageDataset):
+    dataset_dir = "shinpuhkan"
+    dataset_name = 'shinpuhkan'
+
+    def __init__(self, root='datasets', **kwargs):
+        self.root = root
+        self.train_path = os.path.join(self.root, self.dataset_dir)
+
+        required_files = [self.train_path]
+        self.check_before_run(required_files)
+
+        train = self.process_train(self.train_path)
+
+        super().__init__(train, [], [], **kwargs)
+
+    def process_train(self, train_path):
+        data = []
+
+        for root, dirs, files in os.walk(train_path):
+            img_names = list(filter(lambda x: x.endswith(".jpg"), files))
+            # fmt: off
+            if len(img_names) == 0: continue
+            # fmt: on
+            for img_name in img_names:
+                img_path = os.path.join(root, img_name)
+                split_path = img_name.split('_')
+                pid = self.dataset_name + "_" + split_path[0]
+                camid = self.dataset_name + "_" + split_path[2]
+                data.append((img_path, pid, camid))
+
+        return data
diff --git a/fastreid/data/datasets/sysu_mm.py b/fastreid/data/datasets/sysu_mm.py
new file mode 100644
index 0000000..bf67fff
--- /dev/null
+++ b/fastreid/data/datasets/sysu_mm.py
@@ -0,0 +1,48 @@
+# encoding: utf-8
+"""
+@author:  xingyu liao
+@contact: sherlockliao01@gmail.com
+"""
+
+import os
+from scipy.io import loadmat
+from glob import glob
+
+from fastreid.data.datasets import DATASET_REGISTRY
+from fastreid.data.datasets.bases import ImageDataset
+import pdb
+
+__all__ = ['SYSU_mm', ]
+
+
+@DATASET_REGISTRY.register()
+class SYSU_mm(ImageDataset):
+    dataset_dir = "SYSU-MM01"
+    dataset_name = "sysumm01"
+
+    def __init__(self, root='datasets', **kwargs):
+        self.root = root
+        self.train_path = os.path.join(self.root, self.dataset_dir)
+
+        required_files = [self.train_path]
+        self.check_before_run(required_files)
+
+        train = self.process_train(self.train_path)
+
+        super().__init__(train, [], [], **kwargs)
+
+    def process_train(self, train_path):
+        data = []
+
+        file_path_list = ['cam1', 'cam2', 'cam4', 'cam5']
+        
+        for file_path in file_path_list:
+            camid = self.dataset_name + "_" + file_path
+            pid_list = os.listdir(os.path.join(train_path, file_path))
+            for pid_dir in pid_list:
+                pid = self.dataset_name + "_" + pid_dir
+                img_list = glob(os.path.join(train_path, file_path, pid_dir, "*.jpg"))
+                for img_path in img_list:
+                    data.append([img_path, pid, camid])
+        return data
+
diff --git a/fastreid/data/datasets/thermalworld.py b/fastreid/data/datasets/thermalworld.py
new file mode 100644
index 0000000..b6df954
--- /dev/null
+++ b/fastreid/data/datasets/thermalworld.py
@@ -0,0 +1,45 @@
+# encoding: utf-8
+"""
+@author:  xingyu liao
+@contact: sherlockliao01@gmail.com
+"""
+
+import os
+from scipy.io import loadmat
+from glob import glob
+
+from fastreid.data.datasets import DATASET_REGISTRY
+from fastreid.data.datasets.bases import ImageDataset
+import pdb
+import random
+import numpy as np
+
+__all__ = ['Thermalworld',]
+
+
+@DATASET_REGISTRY.register()
+class Thermalworld(ImageDataset):
+    dataset_dir = "thermalworld_rgb"
+    dataset_name = "thermalworld"
+
+    def __init__(self, root='datasets', **kwargs):
+        self.root = root
+        self.train_path = os.path.join(self.root, self.dataset_dir)
+
+        required_files = [self.train_path]
+        self.check_before_run(required_files)
+
+        train = self.process_train(self.train_path)
+
+        super().__init__(train, [], [], **kwargs)
+
+    def process_train(self, train_path):
+        data = []
+        pid_list = os.listdir(train_path)
+        for pid_dir in pid_list:
+            pid = self.dataset_name + "_" + pid_dir
+            img_list = glob(os.path.join(train_path, pid_dir,  "*.jpg"))
+            for img_path in img_list:
+                camid = self.dataset_name + "_cam0"
+                data.append([img_path, pid, camid])
+        return data
diff --git a/fastreid/data/datasets/veri.py b/fastreid/data/datasets/veri.py
index 7e3b166..b585c1e 100644
--- a/fastreid/data/datasets/veri.py
+++ b/fastreid/data/datasets/veri.py
@@ -62,6 +62,7 @@ class VeRi(ImageDataset):
             camid -= 1  # index starts from 0
             if is_train:
                 pid = self.dataset_name + "_" + str(pid)
+                camid = self.dataset_name + "_" + str(camid)
             data.append((img_path, pid, camid))
 
         return data
diff --git a/fastreid/data/datasets/viper.py b/fastreid/data/datasets/viper.py
new file mode 100644
index 0000000..730264f
--- /dev/null
+++ b/fastreid/data/datasets/viper.py
@@ -0,0 +1,45 @@
+# encoding: utf-8
+"""
+@author:  xingyu liao
+@contact: sherlockliao01@gmail.com
+"""
+
+import os
+from glob import glob
+
+from fastreid.data.datasets import DATASET_REGISTRY
+from fastreid.data.datasets.bases import ImageDataset
+
+__all__ = ['VIPeR', ]
+
+
+@DATASET_REGISTRY.register()
+class VIPeR(ImageDataset):
+    dataset_dir = "VIPeR"
+    dataset_name = "viper"
+
+    def __init__(self, root='datasets', **kwargs):
+        self.root = root
+        self.train_path = os.path.join(self.root, self.dataset_dir)
+
+        required_files = [self.train_path]
+        self.check_before_run(required_files)
+
+        train = self.process_train(self.train_path)
+
+        super().__init__(train, [], [], **kwargs)
+
+    def process_train(self, train_path):
+        data = []
+
+        file_path_list = ['cam_a', 'cam_b']
+
+        for file_path in file_path_list:
+            camid = self.dataset_name + "_" + file_path
+            img_list = glob(os.path.join(train_path, file_path, "*.bmp"))
+            for img_path in img_list:
+                img_name = img_path.split('/')[-1]
+                pid = self.dataset_name + "_" + img_name.split('_')[0]
+                data.append([img_path, pid, camid])
+
+        return data
diff --git a/fastreid/data/samplers/triplet_sampler.py b/fastreid/data/samplers/triplet_sampler.py
index 4766ed3..a9bcb34 100644
--- a/fastreid/data/samplers/triplet_sampler.py
+++ b/fastreid/data/samplers/triplet_sampler.py
@@ -95,7 +95,6 @@ class BalancedIdentitySampler(Sampler):
 
                 if len(ret) == self.batch_size:
                     yield from ret
-                    del ret
                     ret = []
 
 
@@ -167,5 +166,4 @@ class NaiveIdentitySampler(Sampler):
                 assert len(batch_indices) == self.batch_size, f"batch indices have wrong " \
                                                               f"length with {len(batch_indices)}!"
                 yield from batch_indices
-                del batch_indices
                 batch_indices = []