diff --git a/core/general-server/op/general_detection_op.cpp b/core/general-server/op/general_detection_op.cpp
index 46f5ddf1b508681661b69c60a25b6d7d000e6d4e..b62a2d2544e12d493033cf1bb8e6606d72f614d3 100644
--- a/core/general-server/op/general_detection_op.cpp
+++ b/core/general-server/op/general_detection_op.cpp
@@ -191,42 +191,64 @@ int GeneralDetectionOp::inference() {
 
     boxes = post_processor_.FilterTagDetRes(boxes, ratio_h, ratio_w, srcimg);
 
-    for (int i = boxes.size() - 1; i >= 0; i--) {
-      crop_img = GetRotateCropImage(img, boxes[i]);
-
-      float wh_ratio = float(crop_img.cols) / float(crop_img.rows);
+    float max_wh_ratio = 0.0f;
+    std::vector<cv::Mat> crop_imgs;
+    std::vector<cv::Mat> resize_imgs;
+    int max_resize_w = 0;
+    int max_resize_h = 0;
+    int box_num = boxes.size();
+    std::vector<std::vector<float>> output_rec;
+    for (int i = 0; i < box_num; ++i) {
+      cv::Mat line_img = GetRotateCropImage(img, boxes[i]);
+      float wh_ratio = float(line_img.cols) / float(line_img.rows);
+      max_wh_ratio = max_wh_ratio > wh_ratio ? max_wh_ratio : wh_ratio;
+      crop_imgs.push_back(line_img);
+    }
 
+    for (int i = 0; i < box_num; ++i) {
+      cv::Mat resize_img;
+      crop_img = crop_imgs[i];
       this->resize_op_rec.Run(
-          crop_img, resize_img_rec, wh_ratio, this->use_tensorrt_);
+          crop_img, resize_img, max_wh_ratio, this->use_tensorrt_);
 
       this->normalize_op_.Run(
-          &resize_img_rec, this->mean_rec, this->scale_rec, this->is_scale_);
-
-      std::vector<float> output_rec(
-          1 * 3 * resize_img_rec.rows * resize_img_rec.cols, 0.0f);
-
-      this->permute_op_.Run(&resize_img_rec, output_rec.data());
-
-      // Inference.
-      output_shape = {1, 3, resize_img_rec.rows, resize_img_rec.cols};
-      out_num = std::accumulate(
-          output_shape.begin(), output_shape.end(), 1, std::multiplies<int>());
-      databuf_size_out = out_num * sizeof(float);
-      databuf_data_out = MempoolWrapper::instance().malloc(databuf_size_out);
-      if (!databuf_data_out) {
-        LOG(ERROR) << "Malloc failed, size: " << databuf_size_out;
-        return -1;
-      }
-      memcpy(databuf_data_out, output_rec.data(), databuf_size_out);
-      databuf_char_out = reinterpret_cast<char*>(databuf_data_out);
-      paddle::PaddleBuf paddleBuf(databuf_char_out, databuf_size_out);
-      paddle::PaddleTensor tensor_out;
-      tensor_out.name = "image";
-      tensor_out.dtype = paddle::PaddleDType::FLOAT32;
-      tensor_out.shape = {1, 3, resize_img_rec.rows, resize_img_rec.cols};
-      tensor_out.data = paddleBuf;
-      out->push_back(tensor_out);
+          &resize_img, this->mean_rec, this->scale_rec, this->is_scale_);
+
+      max_resize_w = std::max(max_resize_w, resize_img.cols);
+      max_resize_h = std::max(max_resize_h, resize_img.rows);
+      resize_imgs.push_back(resize_img);
+    }
+    int buf_size = 3 * max_resize_h * max_resize_w;
+    output_rec = std::vector<std::vector<float>>(box_num,
+                     std::vector<float>(buf_size, 0.0f));
+    for (int i = 0; i < box_num; ++i) {
+      resize_img_rec = resize_imgs[i];
+
+      this->permute_op_.Run(&resize_img_rec, output_rec[i].data());
+    }
+
+    // Inference.
+    output_shape = {box_num, 3, max_resize_h, max_resize_w};
+    out_num = std::accumulate(
+        output_shape.begin(), output_shape.end(), 1, std::multiplies<int>());
+    databuf_size_out = out_num * sizeof(float);
+    databuf_data_out = MempoolWrapper::instance().malloc(databuf_size_out);
+    if (!databuf_data_out) {
+      LOG(ERROR) << "Malloc failed, size: " << databuf_size_out;
+      return -1;
+    }
+    int offset = buf_size * sizeof(float);
+    for (int i = 0; i < box_num; ++i) {
+      memcpy(databuf_data_out + i * offset, output_rec[i].data(), offset);
     }
+    databuf_char_out = reinterpret_cast<char*>(databuf_data_out);
+    paddle::PaddleBuf paddleBuf(databuf_char_out, databuf_size_out);
+    paddle::PaddleTensor tensor_out;
+    tensor_out.name = "image";
+    tensor_out.dtype = paddle::PaddleDType::FLOAT32;
+    tensor_out.shape = output_shape;
+    tensor_out.data = paddleBuf;
+    out->push_back(tensor_out);
   }
   out->erase(out->begin(), out->begin() + infer_outnum);
 
diff --git a/core/general-server/op/general_detection_op.h b/core/general-server/op/general_detection_op.h
index 272ed5ff40575d42ac3058ad1824285925fc252c..2cc027f5ed761f2d040c0c1858e81cb70a93fcb0 100644
--- a/core/general-server/op/general_detection_op.h
+++ b/core/general-server/op/general_detection_op.h
@@ -63,7 +63,7 @@ class GeneralDetectionOp
 
     double det_db_thresh_ = 0.3;
     double det_db_box_thresh_ = 0.5;
-    double det_db_unclip_ratio_ = 2.0;
+    double det_db_unclip_ratio_ = 1.5;
 
     std::vector<float> mean_det = {0.485f, 0.456f, 0.406f};
     std::vector<float> scale_det = {1 / 0.229f, 1 / 0.224f, 1 / 0.225f};
diff --git a/core/general-server/op/general_dist_kv_infer_op.cpp b/core/general-server/op/general_dist_kv_infer_op.cpp
index 870f045d43ccf38a73d53e048e1ee435950f8c36..238d4cac3a085ef188f427c8cc3669b7617443d7 100644
--- a/core/general-server/op/general_dist_kv_infer_op.cpp
+++ b/core/general-server/op/general_dist_kv_infer_op.cpp
@@ -186,9 +186,9 @@ int GeneralDistKVInferOp::inference() {
   if (values.size() != keys.size() || values[0].buff.size() == 0) {
     LOG(ERROR) << "cube value return null";
   }
-  // size_t EMBEDDING_SIZE = values[0].buff.size() / sizeof(float);
+   size_t EMBEDDING_SIZE = values[0].buff.size() / sizeof(float);
   // size_t EMBEDDING_SIZE = (values[0].buff.size() - 10) / sizeof(float);
-  size_t EMBEDDING_SIZE = 9;
+  //size_t EMBEDDING_SIZE = 9;
   TensorVector sparse_out;
   sparse_out.resize(sparse_count);
   TensorVector dense_out;
@@ -241,7 +241,7 @@ int GeneralDistKVInferOp::inference() {
 
       // The data generated by pslib has 10 bytes of information to be filtered
       // out
-      memcpy(data_ptr, cur_val->buff.data() + 10, cur_val->buff.size() - 10);
+      memcpy(data_ptr, cur_val->buff.data(), cur_val->buff.size() );
       // VLOG(3) <<  keys[cube_val_idx] << ":" << data_ptr[0] << ", " <<
       // data_ptr[1] << ", " <<data_ptr[2] << ", " <<data_ptr[3] << ", "
       // <<data_ptr[4] << ", " <<data_ptr[5] << ", " <<data_ptr[6] << ", "
diff --git a/core/predictor/framework/bsf-inl.h b/core/predictor/framework/bsf-inl.h
index 7cd8f149b258e453cd62db256a23288e834844de..401c51091ad858f48ad154d083c841a0e6a20010 100755
--- a/core/predictor/framework/bsf-inl.h
+++ b/core/predictor/framework/bsf-inl.h
@@ -215,6 +215,7 @@ TaskHandler<TaskT> TaskExecutor<TaskT>::schedule(
     LOG(ERROR) << "Failed get TaskT from object pool";
     return TaskHandler<TaskT>::valid_handle();
   }
+  task->clear();
 
   /*
   if (!BatchTasks<TaskT>::check_valid(in, out, _overrun)) {
diff --git a/core/predictor/framework/bsf.h b/core/predictor/framework/bsf.h
index aa3aab5603012ce5d2149774d63f4c7d14655adf..17f0c3d2ace16d50c223692b91f5dd30b3764cd0 100755
--- a/core/predictor/framework/bsf.h
+++ b/core/predictor/framework/bsf.h
@@ -99,7 +99,40 @@ struct Task {
     outLodTensorVector.clear();
   }
   ~Task() {
+    read_fd = -1;
+    write_fd = -1;
+    owner_tid = -1;
+    inVectorT_ptr = NULL;
+    outVectorT_ptr = NULL;
+    set_feed_lod_index.clear();
+    set_feed_nobatch_index.clear();
+    vector_fetch_lod_index.clear();
+    set_fetch_nobatch_index.clear();
+    rem = -1;
+    total_feed_batch = 0;
+    taskmeta_num = 0;
+    index.store(0, butil::memory_order_relaxed);
     THREAD_MUTEX_DESTROY(&task_mut);
+    fetch_init = false;
+    outLodTensorVector.clear();
+  }
+
+  void clear(){
+    read_fd = -1;
+    write_fd = -1;
+    owner_tid = -1;
+    inVectorT_ptr = NULL;
+    outVectorT_ptr = NULL;
+    set_feed_lod_index.clear();
+    set_feed_nobatch_index.clear();
+    vector_fetch_lod_index.clear();
+    set_fetch_nobatch_index.clear();
+    rem = -1;
+    total_feed_batch = 0;
+    taskmeta_num = 0;
+    index.store(0, butil::memory_order_relaxed);
+    THREAD_MUTEX_INIT(&task_mut, NULL);
+    fetch_init = false;
     outLodTensorVector.clear();
   }
 
@@ -323,7 +356,7 @@ struct Task {
         size_t feedvar_index = vector_fetch_lod_index[index];
         // 由于PaddleTensor的resize实现，是每次都会清空，所以必须先统计总长度。
         for (size_t taskmeta_index = 0; taskmeta_index < taskmeta_num;
-             ++taskmeta_num) {
+             ++taskmeta_index) {
           data_length +=
               outLodTensorVector[taskmeta_index][index].data.length();
           lod_length += outLodTensorVector[taskmeta_index][index].lod[0].size();
@@ -347,7 +380,7 @@ struct Task {
         size_t once_lod_length = 0;
         size_t last_lod_value = fetchVarTensor.lod[0][lod_length_offset];
         for (size_t taskmeta_index = 0; taskmeta_index < taskmeta_num;
-             ++taskmeta_num) {
+             ++taskmeta_index) {
           void* dst_ptr = fetchVarTensor.data.data() + data_length_offset;
           void* source_ptr =
               outLodTensorVector[taskmeta_index][index].data.data();
diff --git a/core/predictor/framework/infer.h b/core/predictor/framework/infer.h
index 45146e43c6e503b69e3534a119d31c0da9d0bcfa..a824acaff2417dcb5e885c0ae9e1acd6c17e7def 100644
--- a/core/predictor/framework/infer.h
+++ b/core/predictor/framework/infer.h
@@ -277,7 +277,7 @@ class DBReloadableInferEngine : public ReloadableInferEngine {
     LOG(WARNING) << "Loading cube cache[" << next_idx << "] ...";
     std::string model_path = conf.model_dir();
     if (access(model_path.c_str(), F_OK) == 0) {
-      std::string cube_cache_path = model_path + "/" + "cube_cache";
+      std::string cube_cache_path = model_path + "/cube_cache";
       int reload_cache_ret = md->caches[next_idx]->reload_data(cube_cache_path);
       LOG(WARNING) << "Loading cube cache[" << next_idx << "] done.";
     } else {
@@ -437,7 +437,7 @@ class CloneDBReloadableInferEngine
       // create caches
       std::string model_path = conf.model_dir();
       if (access(model_path.c_str(), F_OK) == 0) {
-        std::string cube_cache_path = model_path + "cube_cache";
+        std::string cube_cache_path = model_path + "/cube_cache";
         int reload_cache_ret =
             md->caches[next_idx]->reload_data(cube_cache_path);
         LOG(WARNING) << "create cube cache[" << next_idx << "] done.";
diff --git a/core/predictor/tools/ocrtools/preprocess_op.cpp b/core/predictor/tools/ocrtools/preprocess_op.cpp
index ab69e4d23abbcbebfbfb5c453fbca46ff5e51967..045984e4c004f965d52badc8b8a0b8996224ab7c 100644
--- a/core/predictor/tools/ocrtools/preprocess_op.cpp
+++ b/core/predictor/tools/ocrtools/preprocess_op.cpp
@@ -82,14 +82,14 @@ void ResizeImgType0::Run(const cv::Mat &img, cv::Mat &resize_img,
   else if (resize_h / 32 < 1 + 1e-5)
     resize_h = 32;
   else
-    resize_h = (resize_h / 32) * 32;
+    resize_h = (resize_h / 32 - 1) * 32;
 
   if (resize_w % 32 == 0)
     resize_w = resize_w;
   else if (resize_w / 32 < 1 + 1e-5)
     resize_w = 32;
   else
-    resize_w = (resize_w / 32) * 32;
+    resize_w = (resize_w / 32 - 1) * 32;
   if (!use_tensorrt) {
     cv::resize(img, resize_img, cv::Size(resize_w, resize_h));
     ratio_h = float(resize_h) / float(h);
diff --git a/python/examples/criteo_ctr_with_cube/cube/conf/cube.conf b/python/examples/criteo_ctr_with_cube/cube/conf/cube.conf
new file mode 100755
index 0000000000000000000000000000000000000000..b70f6e34247e410f9b80054010338d3c8f452ec6
--- /dev/null
+++ b/python/examples/criteo_ctr_with_cube/cube/conf/cube.conf
@@ -0,0 +1,13 @@
+[{
+    "dict_name": "test_dict",
+    "shard": 1,
+    "dup": 1,
+    "timeout": 200,
+    "retry": 3,
+    "backup_request": 100,
+    "type": "ipport_list",
+    "load_balancer": "rr",
+    "nodes": [{
+        "ipport_list": "list://127.0.0.1:8027"
+    }]
+}]
diff --git a/python/examples/criteo_ctr_with_cube/cube/conf/gflags.conf b/python/examples/criteo_ctr_with_cube/cube/conf/gflags.conf
new file mode 100755
index 0000000000000000000000000000000000000000..21c7bddebd8f22b91d0ba26a6121007f96a4380b
--- /dev/null
+++ b/python/examples/criteo_ctr_with_cube/cube/conf/gflags.conf
@@ -0,0 +1,4 @@
+--port=8027
+--dict_split=1
+--in_mem=true
+--log_dir=./log/
diff --git a/python/examples/criteo_ctr_with_cube/cube/keys b/python/examples/criteo_ctr_with_cube/cube/keys
new file mode 100755
index 0000000000000000000000000000000000000000..f00c965d8307308469e537302baa73048488f162
--- /dev/null
+++ b/python/examples/criteo_ctr_with_cube/cube/keys
@@ -0,0 +1,10 @@
+1
+2
+3
+4
+5
+6
+7
+8
+9
+10
diff --git a/python/examples/criteo_ctr_with_cube/test_client.py b/python/examples/criteo_ctr_with_cube/test_client.py
index bef04807e9b5d5c2cdc316828ed6f960f0eeb0f8..f12d727a3d2c4f6fce013d1f815f8b589a327dd5 100755
--- a/python/examples/criteo_ctr_with_cube/test_client.py
+++ b/python/examples/criteo_ctr_with_cube/test_client.py
@@ -16,7 +16,7 @@
 from paddle_serving_client import Client
 import sys
 import os
-import criteo as criteo
+import criteo_reader as criteo
 import time
 from paddle_serving_client.metric import auc
 import numpy as np
@@ -35,22 +35,23 @@ reader = dataset.infer_reader(test_filelists, batch, buf_size)
 label_list = []
 prob_list = []
 start = time.time()
-for ei in range(10000):
+for ei in range(100):
     if py_version == 2:
         data = reader().next()
     else:
         data = reader().__next__()
     feed_dict = {}
-    feed_dict['dense_input'] = data[0][0]
+    feed_dict['dense_input'] = np.array(data[0][0]).reshape(1, len(data[0][0]))
+
     for i in range(1, 27):
-        feed_dict["embedding_{}.tmp_0".format(i - 1)] = np.array(data[0][i]).reshape(-1)
+        feed_dict["embedding_{}.tmp_0".format(i - 1)] = np.array(data[0][i]).reshape(len(data[0][i]))
         feed_dict["embedding_{}.tmp_0.lod".format(i - 1)] = [0, len(data[0][i])]
-    fetch_map = client.predict(feed=feed_dict, fetch=["prob"])
+    fetch_map = client.predict(feed=feed_dict, fetch=["prob"],batch=True)
     print(fetch_map)
     prob_list.append(fetch_map['prob'][0][1])
     label_list.append(data[0][-1][0])
 
-print(auc(label_list, prob_list))
+
 end = time.time()
 print(end - start)
 
diff --git a/python/examples/detection/fcos_dcn_r50_fpn_1x_coco/000000014439.jpg b/python/examples/detection/fcos_dcn_r50_fpn_1x_coco/000000014439.jpg
new file mode 100644
index 0000000000000000000000000000000000000000..0abbdab06eb5950b93908cc91adfa640e8a3ac78
Binary files /dev/null and b/python/examples/detection/fcos_dcn_r50_fpn_1x_coco/000000014439.jpg differ
diff --git a/python/examples/detection/fcos_dcn_r50_fpn_1x_coco/000000570688.jpg b/python/examples/detection/fcos_dcn_r50_fpn_1x_coco/000000570688.jpg
deleted file mode 100644
index cb304bd56c4010c08611a30dcca58ea9140cea54..0000000000000000000000000000000000000000
Binary files a/python/examples/detection/fcos_dcn_r50_fpn_1x_coco/000000570688.jpg and /dev/null differ
diff --git a/python/examples/detection/fcos_dcn_r50_fpn_1x_coco/README.md b/python/examples/detection/fcos_dcn_r50_fpn_1x_coco/README.md
index 5612b754ae9610ed351a4becfec6b47bdcb57c8d..58d13e53fe9ac3b177a3b6e6661a1370efa796b9 100644
--- a/python/examples/detection/fcos_dcn_r50_fpn_1x_coco/README.md
+++ b/python/examples/detection/fcos_dcn_r50_fpn_1x_coco/README.md
@@ -16,5 +16,5 @@ This model support TensorRT, if you want a faster inference, please use `--use_t
 
 ### Perform prediction
 ```
-python3 test_client.py 000000570688.jpg
+python3 test_client.py 000000014439.jpg
 ```
diff --git a/python/examples/detection/fcos_dcn_r50_fpn_1x_coco/README_CN.md b/python/examples/detection/fcos_dcn_r50_fpn_1x_coco/README_CN.md
index d9737261632c64172684fea0d60c566f242e95e6..af2fd8753cc56ef9c732c21020712674313ac4fa 100644
--- a/python/examples/detection/fcos_dcn_r50_fpn_1x_coco/README_CN.md
+++ b/python/examples/detection/fcos_dcn_r50_fpn_1x_coco/README_CN.md
@@ -18,5 +18,5 @@ python3 -m paddle_serving_server.serve --model serving_server --port 9494 --gpu_
 
 ### 执行预测
 ```
-python3 test_client.py 000000570688.jpg
+python3 test_client.py 000000014439.jpg
 ```
diff --git a/python/examples/detection/fcos_dcn_r50_fpn_1x_coco/test_client.py b/python/examples/detection/fcos_dcn_r50_fpn_1x_coco/test_client.py
index f7cdc745b97c1e07cf82c8a1b9a8a25323d1b4af..4c441f5dbb8fa086a5cf15dc457a5215affc8463 100644
--- a/python/examples/detection/fcos_dcn_r50_fpn_1x_coco/test_client.py
+++ b/python/examples/detection/fcos_dcn_r50_fpn_1x_coco/test_client.py
@@ -27,7 +27,7 @@ preprocess = Sequential([
         PadStride(128)
 ])
 
-postprocess = RCNNPostprocess("label_list.txt", "output")
+postprocess = RCNNPostprocess("label_list.txt", "output", [608, 608])
 client = Client()
 
 client.load_client_config("serving_client/serving_client_conf.prototxt")
@@ -41,5 +41,6 @@ fetch_map = client.predict(
     },
     fetch=["save_infer_model/scale_0.tmp_1"],
     batch=False)
+print(fetch_map)
 fetch_map["image"] = sys.argv[1]
 postprocess(fetch_map)
diff --git a/python/examples/detection/ssd_vgg16_300_240e_voc/000000014439.jpg b/python/examples/detection/ssd_vgg16_300_240e_voc/000000014439.jpg
new file mode 100644
index 0000000000000000000000000000000000000000..0abbdab06eb5950b93908cc91adfa640e8a3ac78
Binary files /dev/null and b/python/examples/detection/ssd_vgg16_300_240e_voc/000000014439.jpg differ
diff --git a/python/examples/detection/ssd_vgg16_300_240e_voc/000000570688.jpg b/python/examples/detection/ssd_vgg16_300_240e_voc/000000570688.jpg
deleted file mode 100644
index cb304bd56c4010c08611a30dcca58ea9140cea54..0000000000000000000000000000000000000000
Binary files a/python/examples/detection/ssd_vgg16_300_240e_voc/000000570688.jpg and /dev/null differ
diff --git a/python/examples/detection/ssd_vgg16_300_240e_voc/README.md b/python/examples/detection/ssd_vgg16_300_240e_voc/README.md
index 60a22fdb5d3c1486827376d935c4f39de1b2c387..8a9a766c7b24d8468cbc72d6affd90263e86b013 100644
--- a/python/examples/detection/ssd_vgg16_300_240e_voc/README.md
+++ b/python/examples/detection/ssd_vgg16_300_240e_voc/README.md
@@ -16,5 +16,5 @@ This model support TensorRT, if you want a faster inference, please use `--use_t
 
 ### Perform prediction
 ```
-python3 test_client.py 000000570688.jpg
+python3 test_client.py 000000014439.jpg
 ```
diff --git a/python/examples/detection/ssd_vgg16_300_240e_voc/README_CN.md b/python/examples/detection/ssd_vgg16_300_240e_voc/README_CN.md
index a2e0d187a5e896f796dec4ed0dbdcb3af4ed5334..d3df37d774bd1a478af0a41a9fca9f238ca69aac 100644
--- a/python/examples/detection/ssd_vgg16_300_240e_voc/README_CN.md
+++ b/python/examples/detection/ssd_vgg16_300_240e_voc/README_CN.md
@@ -18,5 +18,5 @@ python3 -m paddle_serving_server.serve --model serving_server --port 9494 --gpu_
 
 ### 执行预测
 ```
-python3 test_client.py 000000570688.jpg
+python3 test_client.py 000000014439.jpg
 ```
diff --git a/python/examples/detection/ssd_vgg16_300_240e_voc/test_client.py b/python/examples/detection/ssd_vgg16_300_240e_voc/test_client.py
index f7cdc745b97c1e07cf82c8a1b9a8a25323d1b4af..4c441f5dbb8fa086a5cf15dc457a5215affc8463 100644
--- a/python/examples/detection/ssd_vgg16_300_240e_voc/test_client.py
+++ b/python/examples/detection/ssd_vgg16_300_240e_voc/test_client.py
@@ -27,7 +27,7 @@ preprocess = Sequential([
         PadStride(128)
 ])
 
-postprocess = RCNNPostprocess("label_list.txt", "output")
+postprocess = RCNNPostprocess("label_list.txt", "output", [608, 608])
 client = Client()
 
 client.load_client_config("serving_client/serving_client_conf.prototxt")
@@ -41,5 +41,6 @@ fetch_map = client.predict(
     },
     fetch=["save_infer_model/scale_0.tmp_1"],
     batch=False)
+print(fetch_map)
 fetch_map["image"] = sys.argv[1]
 postprocess(fetch_map)
diff --git a/python/examples/pipeline/PaddleClas/DarkNet53/benchmark.py b/python/examples/pipeline/PaddleClas/DarkNet53/benchmark.py
index 71b5219441a536789e02e4549c84a5cd550bc70f..3e5db19b69fc8693adfe77a84297436bfb497642 100644
--- a/python/examples/pipeline/PaddleClas/DarkNet53/benchmark.py
+++ b/python/examples/pipeline/PaddleClas/DarkNet53/benchmark.py
@@ -28,7 +28,7 @@ from paddle_serving_client.utils import benchmark_args, show_latency
 
 def parse_benchmark(filein, fileout):
     with open(filein, "r") as fin:
-        res = yaml.load(fin)
+        res = yaml.load(fin, yaml.FullLoader)
         del_list = []
         for key in res["DAG"].keys():
             if "call" in key:
@@ -41,7 +41,7 @@ def parse_benchmark(filein, fileout):
 
 def gen_yml(device, gpu_id):
     fin = open("config.yml", "r")
-    config = yaml.load(fin)
+    config = yaml.load(fin, yaml.FullLoader)
     fin.close()
     config["dag"]["tracer"] = {"interval_s": 10}
     if device == "gpu":
diff --git a/python/examples/pipeline/PaddleClas/HRNet_W18_C/benchmark.py b/python/examples/pipeline/PaddleClas/HRNet_W18_C/benchmark.py
index 90a3ff9bdda545a01427a26146edcbdf8332da30..c80da12ce36618e75897b33d58e4f4febd382861 100644
--- a/python/examples/pipeline/PaddleClas/HRNet_W18_C/benchmark.py
+++ b/python/examples/pipeline/PaddleClas/HRNet_W18_C/benchmark.py
@@ -28,7 +28,7 @@ from paddle_serving_client.utils import benchmark_args, show_latency
 
 def parse_benchmark(filein, fileout):
     with open(filein, "r") as fin:
-        res = yaml.load(fin)
+        res = yaml.load(fin, yaml.FullLoader)
         del_list = []
         for key in res["DAG"].keys():
             if "call" in key:
@@ -41,7 +41,7 @@ def parse_benchmark(filein, fileout):
 
 def gen_yml(device, gpu_id):
     fin = open("config.yml", "r")
-    config = yaml.load(fin)
+    config = yaml.load(fin, yaml.FullLoader)
     fin.close()
     config["dag"]["tracer"] = {"interval_s": 10}
     if device == "gpu":
diff --git a/python/examples/pipeline/PaddleClas/MobileNetV1/benchmark.py b/python/examples/pipeline/PaddleClas/MobileNetV1/benchmark.py
index 90a3ff9bdda545a01427a26146edcbdf8332da30..c80da12ce36618e75897b33d58e4f4febd382861 100644
--- a/python/examples/pipeline/PaddleClas/MobileNetV1/benchmark.py
+++ b/python/examples/pipeline/PaddleClas/MobileNetV1/benchmark.py
@@ -28,7 +28,7 @@ from paddle_serving_client.utils import benchmark_args, show_latency
 
 def parse_benchmark(filein, fileout):
     with open(filein, "r") as fin:
-        res = yaml.load(fin)
+        res = yaml.load(fin, yaml.FullLoader)
         del_list = []
         for key in res["DAG"].keys():
             if "call" in key:
@@ -41,7 +41,7 @@ def parse_benchmark(filein, fileout):
 
 def gen_yml(device, gpu_id):
     fin = open("config.yml", "r")
-    config = yaml.load(fin)
+    config = yaml.load(fin, yaml.FullLoader)
     fin.close()
     config["dag"]["tracer"] = {"interval_s": 10}
     if device == "gpu":
diff --git a/python/examples/pipeline/PaddleClas/MobileNetV2/benchmark.py b/python/examples/pipeline/PaddleClas/MobileNetV2/benchmark.py
index 90a3ff9bdda545a01427a26146edcbdf8332da30..c80da12ce36618e75897b33d58e4f4febd382861 100644
--- a/python/examples/pipeline/PaddleClas/MobileNetV2/benchmark.py
+++ b/python/examples/pipeline/PaddleClas/MobileNetV2/benchmark.py
@@ -28,7 +28,7 @@ from paddle_serving_client.utils import benchmark_args, show_latency
 
 def parse_benchmark(filein, fileout):
     with open(filein, "r") as fin:
-        res = yaml.load(fin)
+        res = yaml.load(fin, yaml.FullLoader)
         del_list = []
         for key in res["DAG"].keys():
             if "call" in key:
@@ -41,7 +41,7 @@ def parse_benchmark(filein, fileout):
 
 def gen_yml(device, gpu_id):
     fin = open("config.yml", "r")
-    config = yaml.load(fin)
+    config = yaml.load(fin, yaml.FullLoader)
     fin.close()
     config["dag"]["tracer"] = {"interval_s": 10}
     if device == "gpu":
diff --git a/python/examples/pipeline/PaddleClas/MobileNetV3_large_x1_0/benchmark.py b/python/examples/pipeline/PaddleClas/MobileNetV3_large_x1_0/benchmark.py
index 90a3ff9bdda545a01427a26146edcbdf8332da30..c80da12ce36618e75897b33d58e4f4febd382861 100644
--- a/python/examples/pipeline/PaddleClas/MobileNetV3_large_x1_0/benchmark.py
+++ b/python/examples/pipeline/PaddleClas/MobileNetV3_large_x1_0/benchmark.py
@@ -28,7 +28,7 @@ from paddle_serving_client.utils import benchmark_args, show_latency
 
 def parse_benchmark(filein, fileout):
     with open(filein, "r") as fin:
-        res = yaml.load(fin)
+        res = yaml.load(fin, yaml.FullLoader)
         del_list = []
         for key in res["DAG"].keys():
             if "call" in key:
@@ -41,7 +41,7 @@ def parse_benchmark(filein, fileout):
 
 def gen_yml(device, gpu_id):
     fin = open("config.yml", "r")
-    config = yaml.load(fin)
+    config = yaml.load(fin, yaml.FullLoader)
     fin.close()
     config["dag"]["tracer"] = {"interval_s": 10}
     if device == "gpu":
diff --git a/python/examples/pipeline/PaddleClas/ResNeXt101_vd_64x4d/benchmark.py b/python/examples/pipeline/PaddleClas/ResNeXt101_vd_64x4d/benchmark.py
index 90a3ff9bdda545a01427a26146edcbdf8332da30..c80da12ce36618e75897b33d58e4f4febd382861 100644
--- a/python/examples/pipeline/PaddleClas/ResNeXt101_vd_64x4d/benchmark.py
+++ b/python/examples/pipeline/PaddleClas/ResNeXt101_vd_64x4d/benchmark.py
@@ -28,7 +28,7 @@ from paddle_serving_client.utils import benchmark_args, show_latency
 
 def parse_benchmark(filein, fileout):
     with open(filein, "r") as fin:
-        res = yaml.load(fin)
+        res = yaml.load(fin, yaml.FullLoader)
         del_list = []
         for key in res["DAG"].keys():
             if "call" in key:
@@ -41,7 +41,7 @@ def parse_benchmark(filein, fileout):
 
 def gen_yml(device, gpu_id):
     fin = open("config.yml", "r")
-    config = yaml.load(fin)
+    config = yaml.load(fin, yaml.FullLoader)
     fin.close()
     config["dag"]["tracer"] = {"interval_s": 10}
     if device == "gpu":
diff --git a/python/examples/pipeline/PaddleClas/ResNet50_vd/benchmark.py b/python/examples/pipeline/PaddleClas/ResNet50_vd/benchmark.py
index 90a3ff9bdda545a01427a26146edcbdf8332da30..c80da12ce36618e75897b33d58e4f4febd382861 100644
--- a/python/examples/pipeline/PaddleClas/ResNet50_vd/benchmark.py
+++ b/python/examples/pipeline/PaddleClas/ResNet50_vd/benchmark.py
@@ -28,7 +28,7 @@ from paddle_serving_client.utils import benchmark_args, show_latency
 
 def parse_benchmark(filein, fileout):
     with open(filein, "r") as fin:
-        res = yaml.load(fin)
+        res = yaml.load(fin, yaml.FullLoader)
         del_list = []
         for key in res["DAG"].keys():
             if "call" in key:
@@ -41,7 +41,7 @@ def parse_benchmark(filein, fileout):
 
 def gen_yml(device, gpu_id):
     fin = open("config.yml", "r")
-    config = yaml.load(fin)
+    config = yaml.load(fin, yaml.FullLoader)
     fin.close()
     config["dag"]["tracer"] = {"interval_s": 10}
     if device == "gpu":
diff --git a/python/examples/pipeline/PaddleClas/ResNet50_vd_FPGM/benchmark.py b/python/examples/pipeline/PaddleClas/ResNet50_vd_FPGM/benchmark.py
index 90a3ff9bdda545a01427a26146edcbdf8332da30..c80da12ce36618e75897b33d58e4f4febd382861 100644
--- a/python/examples/pipeline/PaddleClas/ResNet50_vd_FPGM/benchmark.py
+++ b/python/examples/pipeline/PaddleClas/ResNet50_vd_FPGM/benchmark.py
@@ -28,7 +28,7 @@ from paddle_serving_client.utils import benchmark_args, show_latency
 
 def parse_benchmark(filein, fileout):
     with open(filein, "r") as fin:
-        res = yaml.load(fin)
+        res = yaml.load(fin, yaml.FullLoader)
         del_list = []
         for key in res["DAG"].keys():
             if "call" in key:
@@ -41,7 +41,7 @@ def parse_benchmark(filein, fileout):
 
 def gen_yml(device, gpu_id):
     fin = open("config.yml", "r")
-    config = yaml.load(fin)
+    config = yaml.load(fin, yaml.FullLoader)
     fin.close()
     config["dag"]["tracer"] = {"interval_s": 10}
     if device == "gpu":
diff --git a/python/examples/pipeline/PaddleClas/ResNet50_vd_KL/benchmark.py b/python/examples/pipeline/PaddleClas/ResNet50_vd_KL/benchmark.py
index 90a3ff9bdda545a01427a26146edcbdf8332da30..c80da12ce36618e75897b33d58e4f4febd382861 100644
--- a/python/examples/pipeline/PaddleClas/ResNet50_vd_KL/benchmark.py
+++ b/python/examples/pipeline/PaddleClas/ResNet50_vd_KL/benchmark.py
@@ -28,7 +28,7 @@ from paddle_serving_client.utils import benchmark_args, show_latency
 
 def parse_benchmark(filein, fileout):
     with open(filein, "r") as fin:
-        res = yaml.load(fin)
+        res = yaml.load(fin, yaml.FullLoader)
         del_list = []
         for key in res["DAG"].keys():
             if "call" in key:
@@ -41,7 +41,7 @@ def parse_benchmark(filein, fileout):
 
 def gen_yml(device, gpu_id):
     fin = open("config.yml", "r")
-    config = yaml.load(fin)
+    config = yaml.load(fin, yaml.FullLoader)
     fin.close()
     config["dag"]["tracer"] = {"interval_s": 10}
     if device == "gpu":
diff --git a/python/examples/pipeline/PaddleClas/ResNet50_vd_PACT/benchmark.py b/python/examples/pipeline/PaddleClas/ResNet50_vd_PACT/benchmark.py
index 90a3ff9bdda545a01427a26146edcbdf8332da30..c80da12ce36618e75897b33d58e4f4febd382861 100644
--- a/python/examples/pipeline/PaddleClas/ResNet50_vd_PACT/benchmark.py
+++ b/python/examples/pipeline/PaddleClas/ResNet50_vd_PACT/benchmark.py
@@ -28,7 +28,7 @@ from paddle_serving_client.utils import benchmark_args, show_latency
 
 def parse_benchmark(filein, fileout):
     with open(filein, "r") as fin:
-        res = yaml.load(fin)
+        res = yaml.load(fin, yaml.FullLoader)
         del_list = []
         for key in res["DAG"].keys():
             if "call" in key:
@@ -41,7 +41,7 @@ def parse_benchmark(filein, fileout):
 
 def gen_yml(device, gpu_id):
     fin = open("config.yml", "r")
-    config = yaml.load(fin)
+    config = yaml.load(fin, yaml.FullLoader)
     fin.close()
     config["dag"]["tracer"] = {"interval_s": 10}
     if device == "gpu":
diff --git a/python/examples/pipeline/PaddleClas/ResNet_V2_50/benchmark.py b/python/examples/pipeline/PaddleClas/ResNet_V2_50/benchmark.py
index 562d159da3ce96233f7f9d2019fbb3061022dc06..4b0336f97c2c520a46d596bf5e435c2b9e3094a9 100644
--- a/python/examples/pipeline/PaddleClas/ResNet_V2_50/benchmark.py
+++ b/python/examples/pipeline/PaddleClas/ResNet_V2_50/benchmark.py
@@ -28,7 +28,7 @@ from paddle_serving_client.utils import benchmark_args, show_latency
 
 def parse_benchmark(filein, fileout):
     with open(filein, "r") as fin:
-        res = yaml.load(fin)
+        res = yaml.load(fin, yaml.FullLoader)
         del_list = []
         for key in res["DAG"].keys():
             if "call" in key:
@@ -41,7 +41,7 @@ def parse_benchmark(filein, fileout):
 
 def gen_yml(device, gpu_id):
     fin = open("config.yml", "r")
-    config = yaml.load(fin)
+    config = yaml.load(fin, yaml.FullLoader)
     fin.close()
     config["dag"]["tracer"] = {"interval_s": 10}
     if device == "gpu":
diff --git a/python/examples/pipeline/PaddleClas/ShuffleNetV2_x1_0/benchmark.py b/python/examples/pipeline/PaddleClas/ShuffleNetV2_x1_0/benchmark.py
index 90a3ff9bdda545a01427a26146edcbdf8332da30..c80da12ce36618e75897b33d58e4f4febd382861 100644
--- a/python/examples/pipeline/PaddleClas/ShuffleNetV2_x1_0/benchmark.py
+++ b/python/examples/pipeline/PaddleClas/ShuffleNetV2_x1_0/benchmark.py
@@ -28,7 +28,7 @@ from paddle_serving_client.utils import benchmark_args, show_latency
 
 def parse_benchmark(filein, fileout):
     with open(filein, "r") as fin:
-        res = yaml.load(fin)
+        res = yaml.load(fin, yaml.FullLoader)
         del_list = []
         for key in res["DAG"].keys():
             if "call" in key:
@@ -41,7 +41,7 @@ def parse_benchmark(filein, fileout):
 
 def gen_yml(device, gpu_id):
     fin = open("config.yml", "r")
-    config = yaml.load(fin)
+    config = yaml.load(fin, yaml.FullLoader)
     fin.close()
     config["dag"]["tracer"] = {"interval_s": 10}
     if device == "gpu":
diff --git a/python/examples/pipeline/PaddleDetection/faster_rcnn/benchmark.py b/python/examples/pipeline/PaddleDetection/faster_rcnn/benchmark.py
index 8a25952cdda2e09f0f74794cf8a2226880f29040..f8d5f2b4fd196048a139867a893b06f47d2778bb 100644
--- a/python/examples/pipeline/PaddleDetection/faster_rcnn/benchmark.py
+++ b/python/examples/pipeline/PaddleDetection/faster_rcnn/benchmark.py
@@ -33,7 +33,7 @@ def cv2_to_base64(image):
 
 def parse_benchmark(filein, fileout):
     with open(filein, "r") as fin:
-        res = yaml.load(fin)
+        res = yaml.load(fin, yaml.FullLoader)
         del_list = []
         for key in res["DAG"].keys():
             if "call" in key:
@@ -46,7 +46,7 @@ def parse_benchmark(filein, fileout):
 
 def gen_yml(device, gpu_id):
     fin = open("config.yml", "r")
-    config = yaml.load(fin)
+    config = yaml.load(fin, yaml.FullLoader)
     fin.close()
     config["dag"]["tracer"] = {"interval_s": 30}
     if device == "gpu":
diff --git a/python/examples/pipeline/PaddleDetection/faster_rcnn/web_service.py b/python/examples/pipeline/PaddleDetection/faster_rcnn/web_service.py
index fa026000e399cf0246df4afa2a37005d40d53d70..08a9122296b801689f3d5faf2c75113b293ea220 100644
--- a/python/examples/pipeline/PaddleDetection/faster_rcnn/web_service.py
+++ b/python/examples/pipeline/PaddleDetection/faster_rcnn/web_service.py
@@ -25,7 +25,7 @@ class FasterRCNNOp(Op):
         self.img_preprocess = Sequential([
             BGR2RGB(), Div(255.0),
             Normalize([0.485, 0.456, 0.406], [0.229, 0.224, 0.225], False),
-            Resize((640, 640)), Transpose((2, 0, 1))
+            Resize(640, 640), Transpose((2, 0, 1))
         ])
         self.img_postprocess = RCNNPostprocess("label_list.txt", "output")
 
diff --git a/python/examples/pipeline/PaddleDetection/ppyolo_mbv3/benchmark.py b/python/examples/pipeline/PaddleDetection/ppyolo_mbv3/benchmark.py
index 45853c065b013754d0d591686a9a03ad0aeb6a3d..611712b6754efd88fc7b51027e99b9bb3e82cf7d 100644
--- a/python/examples/pipeline/PaddleDetection/ppyolo_mbv3/benchmark.py
+++ b/python/examples/pipeline/PaddleDetection/ppyolo_mbv3/benchmark.py
@@ -33,7 +33,7 @@ def cv2_to_base64(image):
 
 def parse_benchmark(filein, fileout):
     with open(filein, "r") as fin:
-        res = yaml.load(fin)
+        res = yaml.load(fin, yaml.FullLoader)
         del_list = []
         for key in res["DAG"].keys():
             if "call" in key:
@@ -46,7 +46,7 @@ def parse_benchmark(filein, fileout):
 
 def gen_yml(device, gpu_id):
     fin = open("config.yml", "r")
-    config = yaml.load(fin)
+    config = yaml.load(fin, yaml.FullLoader)
     fin.close()
     config["dag"]["tracer"] = {"interval_s": 30}
     if device == "gpu":
diff --git a/python/examples/pipeline/PaddleDetection/yolov3/benchmark.py b/python/examples/pipeline/PaddleDetection/yolov3/benchmark.py
index 62732613dbfc6ab0b119609a547ea36c18b11ede..cb73d2f932c12d0559af307b3ecf12ecf7986390 100644
--- a/python/examples/pipeline/PaddleDetection/yolov3/benchmark.py
+++ b/python/examples/pipeline/PaddleDetection/yolov3/benchmark.py
@@ -33,7 +33,7 @@ def cv2_to_base64(image):
 
 def parse_benchmark(filein, fileout):
     with open(filein, "r") as fin:
-        res = yaml.load(fin)
+        res = yaml.load(fin, yaml.FullLoader)
         del_list = []
         for key in res["DAG"].keys():
             if "call" in key:
@@ -46,7 +46,7 @@ def parse_benchmark(filein, fileout):
 
 def gen_yml(device, gpu_id):
     fin = open("config.yml", "r")
-    config = yaml.load(fin)
+    config = yaml.load(fin, yaml.FullLoader)
     fin.close()
     config["dag"]["tracer"] = {"interval_s": 30}
     if device == "gpu":
diff --git a/python/examples/pipeline/bert/benchmark.py b/python/examples/pipeline/bert/benchmark.py
index 5abc646bffffff118ab24414e3a50f06668729d9..ccdbbdf599943ebf757d336b96d4f19b92e1b94a 100644
--- a/python/examples/pipeline/bert/benchmark.py
+++ b/python/examples/pipeline/bert/benchmark.py
@@ -54,7 +54,7 @@ from paddle_serving_client.utils import benchmark_args, show_latency
 
 def parse_benchmark(filein, fileout):
     with open(filein, "r") as fin:
-        res = yaml.load(fin)
+        res = yaml.load(fin, yaml.FullLoader)
         del_list = []
         for key in res["DAG"].keys():
             if "call" in key:
@@ -67,7 +67,7 @@ def parse_benchmark(filein, fileout):
 
 def gen_yml(device):
     fin = open("config.yml", "r")
-    config = yaml.load(fin)
+    config = yaml.load(fin, yaml.FullLoader)
     fin.close()
     config["dag"]["tracer"] = {"interval_s": 10}
     if device == "gpu":
diff --git a/python/examples/pipeline/ocr/benchmark.py b/python/examples/pipeline/ocr/benchmark.py
index 1e39176436b0be11093031ddfc4727ee68671c62..3c1243a1c327a5f94544c7fa56524321cad2892f 100644
--- a/python/examples/pipeline/ocr/benchmark.py
+++ b/python/examples/pipeline/ocr/benchmark.py
@@ -28,7 +28,7 @@ from paddle_serving_client.utils import benchmark_args, show_latency
 
 def parse_benchmark(filein, fileout):
     with open(filein, "r") as fin:
-        res = yaml.load(fin)
+        res = yaml.load(fin, yaml.FullLoader)
         del_list = []
         for key in res["DAG"].keys():
             if "call" in key:
@@ -41,7 +41,7 @@ def parse_benchmark(filein, fileout):
 
 def gen_yml(device):
     fin = open("config.yml", "r")
-    config = yaml.load(fin)
+    config = yaml.load(fin, yaml.FullLoader)
     fin.close()
     config["dag"]["tracer"] = {"interval_s": 10}
     if device == "gpu":
diff --git a/python/examples/pipeline/simple_web_service/benchmark.py b/python/examples/pipeline/simple_web_service/benchmark.py
index c2c612dd2740d7c97da4289a0913270b03611e7a..88c3ea21722ad9e6420e193a69299b2cf8e443a4 100644
--- a/python/examples/pipeline/simple_web_service/benchmark.py
+++ b/python/examples/pipeline/simple_web_service/benchmark.py
@@ -27,7 +27,7 @@ from paddle_serving_client.utils import benchmark_args, show_latency
 
 def gen_yml():
     fin = open("config.yml", "r")
-    config = yaml.load(fin)
+    config = yaml.load(fin, yaml.FullLoader)
     fin.close()
     config["dag"]["tracer"] = {"interval_s": 5}
     with open("config2.yml", "w") as fout:
diff --git a/python/paddle_serving_server/parse_profile.py b/python/paddle_serving_server/parse_profile.py
index 37e801c255272778c6926642beabdcf2f3f92cf0..e718e4685e13ed35f8dba16eb0d5f8a3ff6fd305 100644
--- a/python/paddle_serving_server/parse_profile.py
+++ b/python/paddle_serving_server/parse_profile.py
@@ -96,7 +96,7 @@ if __name__ == "__main__":
     args = parse_args()
     benchmark_cfg_filename = args.benchmark_cfg
     f = open(benchmark_cfg_filename, 'r')
-    benchmark_config = yaml.load(f)
+    benchmark_config = yaml.load(f, yaml.FullLoader)
     f.close()
     benchmark_log_filename = args.benchmark_log
     f = open(benchmark_log_filename, 'r')
diff --git a/python/pipeline/analyse.py b/python/pipeline/analyse.py
index 814b43acaf52bbf0c066ff4bbdce2a0165508a2d..a571ccfe9018fac70523803c40d05df1cf16e271 100644
--- a/python/pipeline/analyse.py
+++ b/python/pipeline/analyse.py
@@ -274,7 +274,7 @@ class OpAnalyst(object):
         """
         import yaml
         with open(op_config_yaml) as f:
-            op_config = yaml.load(f)
+            op_config = yaml.load(f, yaml.FullLoader)
 
         # check that each model is deployed on a different card
         card_set = set()
diff --git a/python/pipeline/pipeline_server.py b/python/pipeline/pipeline_server.py
index c3a904690dcd4a7a044f6afd309553fd1446aa49..5d3fa3540149412186b9335741964910a7ed56d2 100644
--- a/python/pipeline/pipeline_server.py
+++ b/python/pipeline/pipeline_server.py
@@ -341,7 +341,7 @@ class ServerYamlConfChecker(object):
                              " or yml_dict can be selected as the parameter.")
         if yml_file is not None:
             with io.open(yml_file, encoding='utf-8') as f:
-                conf = yaml.load(f.read())
+                conf = yaml.load(f.read(), yaml.FullLoader)
         elif yml_dict is not None:
             conf = yml_dict
         else:
diff --git a/python/requirements.txt b/python/requirements.txt
index c28133c67f6c85e3dd12b08914c7aa0848a4cad7..ba7cf42d9e0a6b4cd713ef245108bb45e7244dda 100644
--- a/python/requirements.txt
+++ b/python/requirements.txt
@@ -7,7 +7,7 @@ protobuf>=3.12.2
 grpcio-tools>=1.28.1
 grpcio>=1.28.1
 func-timeout>=4.3.5
-pyyaml>=1.3.0
+pyyaml>=5.1
 flask>=1.1.2
 click==7.1.2
 itsdangerous==1.1.0
diff --git a/python/requirements_mac.txt b/python/requirements_mac.txt
index b14fbd5fc5b779e6f2d216df434bfeb615d59b05..6a396239c5e68e545bd5af0928b3e6f42b19c82b 100644
--- a/python/requirements_mac.txt
+++ b/python/requirements_mac.txt
@@ -6,7 +6,7 @@ google>=2.0.3
 opencv-python==4.2.0.32
 protobuf>=3.12.2
 func-timeout>=4.3.5
-pyyaml>=1.3.0
+pyyaml>=5.1
 flask>=1.1.2
 click==7.1.2
 itsdangerous==1.1.0