diff --git a/.git_oss_config_pub b/.git_oss_config_pub
index 6299809aa..df66d8e7f 100644
--- a/.git_oss_config_pub
+++ b/.git_oss_config_pub
@@ -3,3 +3,4 @@ git_oss_data_dir = data/git_oss_sample_data
 host = oss-cn-beijing.aliyuncs.com
 git_oss_cache_dir = ${TMPDIR}/${PROJECT_NAME}/.git_oss_cache
 git_oss_private_config = ~/.git_oss_config_private
+accl_endpoint = oss-accelerate.aliyuncs.com
diff --git a/.github/workflows/ci_py3.yml b/.github/workflows/ci_py3.yml
new file mode 100644
index 000000000..28887dc65
--- /dev/null
+++ b/.github/workflows/ci_py3.yml
@@ -0,0 +1,115 @@
+name: CI Build PY3
+on:
+  pull_request:
+    types: [opened, reopened, synchronize]
+
+jobs:
+  ci-test:
+    runs-on: EasyRec-py3-15
+    defaults:
+      run:
+        shell: bash {0}
+    steps:
+      - name: FetchCommit ${{ github.event.pull_request.head.sha }}
+        uses: actions/checkout@v2
+        with:
+          ref: ${{ github.event.pull_request.head.sha }}
+          submodules: recursive
+      - name: RunCiTest
+        id: run_ci_test
+        env:
+          TEST_DEVICES: ""
+          PULL_REQUEST_NUM: ${{ github.event.pull_request.number }}
+        run: |
+           source activate tf15_py3
+           python git-lfs/git_lfs.py pull
+           source scripts/ci_test.sh
+      - name: LabelAndComment
+        env:
+          CI_TEST_PASSED: ${{steps.run_ci_test.outputs.ci_test_passed}}
+        uses: actions/github-script@v5
+        with:
+           script: |
+             const { CI_TEST_PASSED } = process.env
+             labels = await github.rest.issues.listLabelsOnIssue({
+               issue_number: context.issue.number,
+               repo:context.repo.repo,
+               owner:context.repo.owner
+             })
+             console.log('labels.url=' + labels.url)
+
+             labels = labels.data
+
+             var label_names = []
+             if (labels != null) {
+               labels.forEach(tmp_lbl => label_names.push(tmp_lbl.name))
+             }
+             console.log(`ci_test_passed=${CI_TEST_PASSED} labels=${label_names}`);
+
+             var pass_label = null;
+             if (labels != null) {
+                pass_label = labels.find(label=>label.name=='ci_py3_test_passed');
+             }
+
+             var fail_label = null;
+             if (labels != null) {
+                fail_label = labels.find(label=>label.name=='ci_py3_test_failed');
+             }
+
+             if (pass_label) {
+               github.rest.issues.removeLabel({
+                 issue_number: context.issue.number,
+                 owner: context.repo.owner,
+                 repo: context.repo.repo,
+                 name: 'ci_py3_test_passed'
+               })
+             }
+
+             if (fail_label) {
+               github.rest.issues.removeLabel({
+                  issue_number: context.issue.number,
+                  owner: context.repo.owner,
+                  repo: context.repo.repo,
+                  name: 'ci_py3_test_failed'
+               })
+             }
+
+             if (CI_TEST_PASSED == 1) {
+               github.rest.issues.addLabels({
+                  issue_number: context.issue.number,
+                  owner: context.repo.owner,
+                  repo: context.repo.repo,
+                  labels: ['ci_py3_test_passed']
+               })
+
+               github.rest.issues.createComment({
+                  owner: context.repo.owner,
+                  repo: context.repo.repo,
+                  issue_number: context.issue.number,
+                  body: "CI PY3 Test Passed"
+               })
+             } else {
+               github.rest.issues.addLabels({
+                  issue_number: context.issue.number,
+                  owner: context.repo.owner,
+                  repo: context.repo.repo,
+                  labels: ['ci_py3_test_failed']
+               })
+
+               github.rest.issues.createComment({
+                  owner: context.repo.owner,
+                  repo: context.repo.repo,
+                  issue_number: context.issue.number,
+                  body: "CI PY3 Test Failed"
+               })
+             }
+      - name: SignalFail
+        env:
+          CI_TEST_PASSED: ${{steps.run_ci_test.outputs.ci_test_passed}}
+        run: |
+          echo "CI_TEST_PASSED=${CI_TEST_PASSED}"
+          if [ $CI_TEST_PASSED -ne 1 ]
+          then
+            echo "ci_py3_test_failed, will exit"
+            exit 1
+          fi
diff --git a/easy_rec/python/model/multi_tower_bst.py b/easy_rec/python/model/multi_tower_bst.py
index 6d93ebeda..11a21f98d 100644
--- a/easy_rec/python/model/multi_tower_bst.py
+++ b/easy_rec/python/model/multi_tower_bst.py
@@ -73,7 +73,7 @@ def attention_net(self, net, dim, cur_seq_len, seq_size, name):
 
     hist_mask = tf.sequence_mask(
         cur_seq_len, maxlen=seq_size - 1)  # [B, seq_size-1]
-    cur_id_mask = tf.ones([tf.shape(hist_mask)[0], 1], dtype=tf.bool)  # [B, 1]
+    cur_id_mask = tf.ones(tf.stack([tf.shape(hist_mask)[0], 1]), dtype=tf.bool)  # [B, 1]
     mask = tf.concat([hist_mask, cur_id_mask], axis=1)  # [B, seq_size]
     masks = tf.reshape(tf.tile(mask, [1, seq_size]),
                        (-1, seq_size, seq_size))  # [B, seq_size, seq_size]
diff --git a/easy_rec/python/test/train_eval_test.py b/easy_rec/python/test/train_eval_test.py
index 017e02f17..93d18da34 100644
--- a/easy_rec/python/test/train_eval_test.py
+++ b/easy_rec/python/test/train_eval_test.py
@@ -4,6 +4,7 @@
 import glob
 import logging
 import os
+import sys
 import unittest
 from distutils.version import LooseVersion
 
@@ -255,24 +256,36 @@ def test_metric_learning(self):
         'samples/model_config/metric_learning_on_taobao.config', self._test_dir)
     self.assertTrue(self._success)
 
+  @unittest.skipIf((sys.version_info.major, sys.version_info.minor) > (3,6),
+      'Currently graph-learn not support python3.7'
+  )
   def test_dssm_neg_sampler(self):
     self._success = test_utils.test_single_train_eval(
         'samples/model_config/dssm_neg_sampler_on_taobao.config',
         self._test_dir)
     self.assertTrue(self._success)
 
+  @unittest.skipIf((sys.version_info.major, sys.version_info.minor) > (3,6),
+      'Currently graph-learn not support python3.7'
+  )
   def test_dssm_neg_sampler_v2(self):
     self._success = test_utils.test_single_train_eval(
         'samples/model_config/dssm_neg_sampler_v2_on_taobao.config',
         self._test_dir)
     self.assertTrue(self._success)
 
+  @unittest.skipIf((sys.version_info.major, sys.version_info.minor) > (3,6),
+      'Currently graph-learn not support python3.7'
+  )
   def test_dssm_hard_neg_sampler(self):
     self._success = test_utils.test_single_train_eval(
         'samples/model_config/dssm_hard_neg_sampler_on_taobao.config',
         self._test_dir)
     self.assertTrue(self._success)
 
+  @unittest.skipIf((sys.version_info.major, sys.version_info.minor) > (3,6),
+      'Currently graph-learn not support python3.7'
+  )
   def test_dssm_hard_neg_sampler_v2(self):
     self._success = test_utils.test_single_train_eval(
         'samples/model_config/dssm_hard_neg_sampler_v2_on_taobao.config',
diff --git a/git-lfs/git_lfs.py b/git-lfs/git_lfs.py
index 89e64d799..caa191c59 100644
--- a/git-lfs/git_lfs.py
+++ b/git-lfs/git_lfs.py
@@ -226,6 +226,8 @@ def get_yes_no(msg):
     host = None
     bucket_name = None
     git_oss_private_path = None
+    enable_accelerate = 0
+    accl_endpoint = None
     for line_str in fin:
       line_str = line_str.strip()
       if len(line_str) == 0:
@@ -248,6 +250,8 @@ def get_yes_no(msg):
           git_oss_private_path = os.path.join(os.environ['HOME'], git_oss_private_path[2:])
       elif line_tok[0] == 'git_oss_cache_dir':
         git_oss_cache_dir = line_tok[1]
+      elif line_tok[0] == 'accl_endpoint':
+        accl_endpoint = line_tok[1]
         
     logging.info('git_oss_data_dir=%s, host=%s, bucket_name=%s' % (
       git_oss_data_dir, host, bucket_name))
@@ -353,15 +357,43 @@ def get_yes_no(msg):
       remote_path = git_bin_url[leaf_path][1]
       _, file_name_with_sig = os.path.split(remote_path)
       tar_tmp_path = '%s/%s.tar.gz' % (git_oss_cache_dir, file_name_with_sig)
-      if not os.path.exists(tar_tmp_path):
-        if oss_bucket:
-          oss_bucket.get_object_to_file(remote_path, tar_tmp_path)
-        else:
-          url = 'http://%s.%s/%s' % (bucket_name, host, remote_path)
-          subprocess.check_output(['wget', url, '-O', tar_tmp_path])
-      else:
-        logging.info('%s is in cache' % file_name_with_sig)
-      subprocess.check_output(['tar', '-zxf', tar_tmp_path])
+
+      max_retry = 5
+      while max_retry > 0:
+        try:
+          if not os.path.exists(tar_tmp_path):
+            in_cache = False
+            if oss_bucket:
+              oss_bucket.get_object_to_file(remote_path, tar_tmp_path)
+            else:
+              url = 'http://%s.%s/%s' % (bucket_name, host, remote_path)
+              subprocess.check_output(['wget', url, '-O', tar_tmp_path])
+          else:
+            in_cache = True
+            logging.info('%s is in cache' % file_name_with_sig)
+          subprocess.check_output(['tar', '-zxf', tar_tmp_path])
+          local_sig = get_local_sig(leaf_files)
+          if local_sig == remote_sig:
+            break
+          if in_cache:
+            logging.warning('cache invalid, will download from remote')
+            os.remove(tar_tmp_path)
+            continue
+          logging.warning('download failed, local_sig(%s) != remote_sig(%s)' % (
+              local_sig, remote_sig))
+        except subprocess.CalledProcessError as ex:
+          logging.error("exception: %s" % str(ex))
+        except oss2.exceptions.RequestError as ex:
+          logging.error("exception: %s" % str(ex))
+       
+        os.remove(tar_tmp_path)
+        if accl_endpoint is not None and host != accl_endpoint:
+          logging.info('will try accelerate endpoint: %s' % accl_endpoint)
+          host = accl_endpoint
+          if oss_auth:
+            oss_bucket = oss2.Bucket(oss_auth, host, bucket_name)
+        max_retry -= 1
+   
       logging.info('%s updated' % leaf_path)
       any_update = True
     if not any_update: