diff --git a/python/jittor/__init__.py b/python/jittor/__init__.py
index b63a3afa..da59bb86 100644
--- a/python/jittor/__init__.py
+++ b/python/jittor/__init__.py
@@ -7,7 +7,7 @@
 # This file is subject to the terms and conditions defined in
 # file 'LICENSE.txt', which is part of this source code package.
 # ***************************************************************
-__version__ = '1.1.7.11'
+__version__ = '1.1.7.12'
 from . import lock
 with lock.lock_scope():
     from . import compiler
diff --git a/python/jittor/compiler.py b/python/jittor/compiler.py
index 95fa28a9..9ef86c0b 100644
--- a/python/jittor/compiler.py
+++ b/python/jittor/compiler.py
@@ -784,11 +784,16 @@ def try_find_exe(*args):
 def check_pybt(gdb_path, python_path):
     if gdb_path=='' or python_path=='':
         return False
-    ret = sp.getoutput(f"{gdb_path} --batch {python_path} -ex 'help py-bt'")
-    if 'python frame' in ret:
-        LOG.v("py-bt found in gdb.")
-        return True
-    return False
+    return True
+    # TODO: prev we use below code to check has py-bt or nor
+    # but it is too slow, so we comment it,
+    # find a better way to check py-bt exist
+    
+    # ret = sp.getoutput(f"{gdb_path} --batch {python_path} -ex 'help py-bt'")
+    # if 'python frame' in ret:
+    #     LOG.v("py-bt found in gdb.")
+    #     return True
+    # return False
 
 def check_debug_flags():
     global is_debug
diff --git a/python/jittor/pyjt_compiler.py b/python/jittor/pyjt_compiler.py
index 7d2f3aac..542c9c6f 100644
--- a/python/jittor/pyjt_compiler.py
+++ b/python/jittor/pyjt_compiler.py
@@ -449,7 +449,7 @@ def compile_src(src, h, basename):
             continue
         else:
             defs.append(def_info)
-        LOG.vvv(json.dumps(def_info, indent=4))
+        LOG.vvv(lambda: json.dumps(def_info, indent=4))
     # deal with defs
     if len(defs) == 0: return
     # include_name = h[4:] # remove "src/" prefix
diff --git a/python/jittor/test/test_init.py b/python/jittor/test/test_init.py
new file mode 100644
index 00000000..58b9099a
--- /dev/null
+++ b/python/jittor/test/test_init.py
@@ -0,0 +1,59 @@
+# ***************************************************************
+# Copyright (c) Jittor 2020, Author:
+# All Rights Reserved.
+# This file is subject to the terms and conditions defined in
+# file 'LICENSE.txt', which is part of this source code package.
+# ***************************************************************
+import jittor as jt
+import unittest
+import numpy as np
+from jittor import models
+
+pass_this_test = False
+try:
+    jt.dirty_fix_pytorch_runtime_error()
+    import torch
+    import torchvision
+except Exception as e:
+    pass_this_test = True
+
+def get_error(a, b):
+    return np.abs(a-b) / max(np.abs(a), np.abs(b), 1e-5) , np.abs(a-b)
+
+def check(jt_mod, torch_mod, rtol=1e-2, atol=1e-5, mean_atol=1e-5):
+    pa = [ p for p in jt_mod.parameters() if not p.is_stop_grad() ]
+    pb = list(torch_mod.parameters())
+    assert len(pa) == len(pb)
+    error_count = 0
+    for a,b in zip(pa, pb):
+        assert a.shape == list(b.shape), (a.shape, b.shape, a.name())
+        stda, meana = np.std(a.numpy()), np.mean(a.numpy())
+        stdb, meanb = np.std(b.detach().numpy()), np.mean(b.detach().numpy())
+
+        r_err, a_err = get_error(stda, stdb)
+        if r_err > rtol and a_err > atol:
+            error_count += 1
+            print("compare std error", stda, stdb, r_err, a_err, a.name(), a.shape)
+
+        r_err, a_err = get_error(meana, meanb)
+        if r_err > rtol and a_err > mean_atol:
+            error_count += 1
+            print("compare mean error", meana, meanb, r_err, a_err, a.name(), a.shape)
+    assert error_count == 0
+
+@unittest.skipIf(pass_this_test, f"pass init check, no torch found")
+class TestInit(unittest.TestCase):
+    @classmethod
+    def setUpClass(self):
+        jt.seed(0)
+        np.random.seed(0)
+        torch.manual_seed(0)
+
+    def test_conv(self):
+        check(jt.nn.Conv(64, 256, 3), torch.nn.Conv2d(64, 256, 3), rtol=1e-1, mean_atol=1e-3)
+
+    def test_resnet(self):
+        check(models.resnet152(), torchvision.models.resnet152(), rtol=2e-2, mean_atol=1e-2)
+
+if __name__ == "__main__":
+    unittest.main()
\ No newline at end of file
diff --git a/python/jittor_utils/__init__.py b/python/jittor_utils/__init__.py
index 994db7b9..a3d33543 100644
--- a/python/jittor_utils/__init__.py
+++ b/python/jittor_utils/__init__.py
@@ -31,18 +31,20 @@ class LogWarper:
         return cc.log_capture_read()
 
     def _log(self, level, verbose, *msg):
-        if len(msg):
-            msg = " ".join([ str(m) for m in msg ])
-        else:
-            msg = str(msg)
+        if self.log_silent or verbose > self.log_v:
+            return
+        ss = ""
+        for m in msg:
+            if callable(m):
+                m = m()
+            ss += str(m)
+        msg = ss
         f = inspect.currentframe()
         fileline = inspect.getframeinfo(f.f_back.f_back)
         fileline = f"{os.path.basename(fileline.filename)}:{fileline.lineno}"
         if cc and hasattr(cc, "log"):
             cc.log(fileline, level, verbose, msg)
         else:
-            if self.log_silent or verbose > self.log_v:
-                return
             time = datetime.datetime.now().strftime("%m%d %H:%M:%S.%f")
             tid = threading.get_ident()%100
             v = f" v{verbose}" if verbose else ""