diff --git a/.github/scripts/run-bisection.sh b/.github/scripts/run-bisection.sh
index 4df814cef8..f1505f8574 100644
--- a/.github/scripts/run-bisection.sh
+++ b/.github/scripts/run-bisection.sh
@@ -43,5 +43,4 @@ python bisection.py --work-dir ${BISECT_BASE}/gh${GITHUB_RUN_ID} \
        --pytorch-src ${PYTORCH_SRC_DIR} \
        --torchbench-src ${TORCHBENCH_SRC_DIR} \
        --config ${BISECT_BASE}/config.yaml \
-       --output ${BISECT_BASE}/gh${GITHUB_RUN_ID}/result.json \
-       --debug
+       --output ${BISECT_BASE}/gh${GITHUB_RUN_ID}/result.json
diff --git a/bisection.py b/bisection.py
index 16b5a77f72..0bd1f872fe 100644
--- a/bisection.py
+++ b/bisection.py
@@ -41,14 +41,21 @@ def exist_dir_path(string):
 # For example, ["test_eval[yolov3-cpu-eager]", "test_train[yolov3-gpu-eager]"]
 #     -> "((eval and yolov3 and cpu and eager) or (train and yolov3 and gpu and eager))"
 # If targets is None, run everything except slomo
-def targets_to_bmfilter(targets: List[str]) -> str:
+def targets_to_bmfilter(targets: List[str], models: List[str]) -> str:
     bmfilter_names = []
     if targets == None or len(targets) == 0:
         return "(not slomo)"
     for test in targets:
         regex = re.compile("test_(train|eval)\[([a-zA-Z0-9_]+)-([a-z]+)-([a-z]+)\]")
         m = regex.match(test).groups()
-        partial_name = " and ".join(m)
+        if not m:
+            if m in models:
+                partial_name = m
+            else:
+                print(f"Cannot recognize the TorchBench filter: {test}. Exit.")
+                exit(1)
+        else:
+            partial_name = " and ".join(m)
         bmfilter_names.append(f"({partial_name})")
     return "(" + " or ".join(bmfilter_names) + ")"
 
@@ -128,11 +135,23 @@ def prep(self) -> bool:
         repo_origin_url = gitutils.get_git_origin(self.srcpath)
         if not repo_origin_url == TORCH_GITREPO:
             print(f"WARNING: Unmatched repo origin url: {repo_origin_url} with standard {TORCH_GITREPO}")
+        self.update_repos()
         return True
-    
+
+    # Update pytorch, torchtext, torchvision, and torchaudio repo
+    def update_repos(self):
+        repos = [self.srcpath]
+        repos.extend(TORCHBENCH_DEPS.values())
+        for repo in repos:
+            gitutils.clean_git_repo(repo)
+            assert gitutils.update_git_repo(repo), f"Failed to update master branch of {repo}."
+
     # Get all commits between start and end, save them in self.commits
-    def init_commits(self, start: str, end: str) -> bool:
-        commits = gitutils.get_git_commits(self.srcpath, start, end)
+    def init_commits(self, start: str, end: str, abtest: bool) -> bool:
+        if not abtest:
+            commits = gitutils.get_git_commits(self.srcpath, start, end)
+        else:
+            commits = [start, end]
         if not commits or len(commits) < 2:
             print(f"Failed to retrieve commits from {start} to {end} in {self.srcpath}.")
             return False
@@ -220,6 +239,7 @@ class TorchBench:
     timelimit: int # timeout limit in minutes
     workdir: str
     devbig: str
+    models: List[str]
     torch_src: TorchSource
 
     def __init__(self, srcpath: str,
@@ -227,19 +247,23 @@ def __init__(self, srcpath: str,
                  timelimit: int,
                  workdir: str,
                  devbig: str,
-                 branch: str = "0.1"):
+                 branch: str = "master"):
         self.srcpath = srcpath
         self.torch_src = torch_src
         self.timelimit = timelimit
         self.workdir = workdir
         self.devbig = devbig
         self.branch = branch
+        self.models = list()
 
     def prep(self) -> bool:
         # Verify the code in srcpath is pytorch/benchmark
         repo_origin_url = gitutils.get_git_origin(self.srcpath)
         if not repo_origin_url == TORCHBENCH_GITREPO:
             print(f"WARNING: Unmatched repo origin url: {repo_origin_url} with standard {TORCHBENCH_GITREPO}")
+        # get list of models
+        self.models = [ model for model in os.listdir(os.path.join(self.srcpath, "torchbenchmark", "models"))
+                        if os.path.isdir(os.path.join(self.srcpath, "torchbenchmark", "models", model)) ]
         return True
  
     def run_benchmark(self, commit: Commit, targets: List[str]) -> str:
@@ -253,7 +277,7 @@ def run_benchmark(self, commit: Commit, targets: List[str]) -> str:
                 os.remove(os.path.join(output_dir, f))
         else:
             os.mkdir(output_dir)
-        bmfilter = targets_to_bmfilter(targets)
+        bmfilter = targets_to_bmfilter(targets, self.models)
         print(f"Running TorchBench for commit: {commit.sha}, filter {bmfilter} ...", end="", flush=True)
         if not self.devbig:
             command = f"""bash .github/scripts/run-bench.sh "{output_dir}" "{bmfilter}" &> {output_dir}/benchmark.log"""
@@ -395,7 +419,7 @@ def regression(self, left: Commit, right: Commit, targets: List[str]) -> List[st
     def prep(self) -> bool:
         if not self.torch_src.prep():
             return False
-        if not self.torch_src.init_commits(self.start, self.end):
+        if not self.torch_src.init_commits(self.start, self.end, self.abtest):
             return False
         if not self.bench.prep():
             return False
diff --git a/torchbenchmark/util/gitutils.py b/torchbenchmark/util/gitutils.py
index 651e4f7802..6b1ac37d28 100644
--- a/torchbenchmark/util/gitutils.py
+++ b/torchbenchmark/util/gitutils.py
@@ -8,7 +8,16 @@
 from datetime import datetime
 from typing import Optional, List
 
-def update_git_repo(repo: str, branch: str) -> bool:
+def clean_git_repo(repo: str) -> bool:
+    try:
+        command = f"git clean -xdf"
+        subprocess.check_call(command, cwd=repo, shell=True)
+        return True
+    except subprocess.CalledProcessError:
+        print(f"Failed to cleanup git repo {repo}")
+        return None
+
+def update_git_repo_branch(repo: str, branch: str) -> bool:
     try:
         command = f"git pull origin {branch}"
         out = subprocess.check_output(command, cwd=repo, shell=True).decode().strip()