diff --git a/onnx2fluid/examples/convert_data_npz_0.py b/onnx2fluid/examples/convert_data_npz_0.py
index f3eef275bda3079ff97214f15a7ff947e002f517..bd23f527a2f33981496aff1569be0ecfa5b77141 100644
--- a/onnx2fluid/examples/convert_data_npz_0.py
+++ b/onnx2fluid/examples/convert_data_npz_0.py
@@ -31,11 +31,17 @@ def _make_var_name(name):
 fn = sys.argv[1]
 input_names = sys.argv[2].split(':')
 output_name = sys.argv[3].split(':')
+squeeze_data = len(sys.argv) > 4
 
 data = np.load(fn, encoding='bytes')
 input_data = data['inputs']
 output_data = data['outputs']
 
+while squeeze_data and input_data.ndim > 4 and input_data.shape[0] == 1:
+    input_data = input_data.squeeze(0)
+while squeeze_data and output_data.ndim > 2 and output_data.shape[0] == 1:
+    output_data = output_data.squeeze(0)
+
 inputs = Dict(zip(map(_make_var_name, input_names), [input_data]))
 outputs = Dict(zip(map(_make_var_name, output_name), [output_data]))
 
diff --git a/onnx2fluid/examples/convert_data_pb_0.py b/onnx2fluid/examples/convert_data_pb_0.py
index ae211494403b621b3334ea41990fa3ffcba3883b..fefb2711545358322604708dcedd29c149113542 100644
--- a/onnx2fluid/examples/convert_data_pb_0.py
+++ b/onnx2fluid/examples/convert_data_pb_0.py
@@ -36,6 +36,7 @@ def _make_var_name(name):
 data_dir = os.path.dirname(sys.argv[1])
 input_names = sys.argv[2].split(':')
 output_name = sys.argv[3].split(':')
+squeeze_data = len(sys.argv) > 4
 
 # Load inputs
 inputs = []
@@ -43,7 +44,10 @@ for fn in glob(os.path.join(data_dir, 'input_*.pb')):
     tensor = onnx.TensorProto()
     with open(fn, 'rb') as f:
         tensor.ParseFromString(f.read())
-    inputs.append(numpy_helper.to_array(tensor))
+    tensor = numpy_helper.to_array(tensor)
+    while squeeze_data and tensor.ndim > 4 and tensor.shape[0] == 1:
+        tensor = tensor.squeeze(0)
+    inputs.append(tensor)
 
 # Load outputs
 outputs = []
@@ -51,7 +55,10 @@ for fn in glob(os.path.join(data_dir, 'output_*.pb')):
     tensor = onnx.TensorProto()
     with open(fn, 'rb') as f:
         tensor.ParseFromString(f.read())
-    outputs.append(numpy_helper.to_array(tensor))
+    tensor = numpy_helper.to_array(tensor)
+    while squeeze_data and tensor.ndim > 2 and tensor.shape[0] == 1:
+        tensor = tensor.squeeze(0)
+    outputs.append(tensor)
 
 inputs = Dict(zip(map(_make_var_name, input_names), inputs))
 outputs = Dict(zip(map(_make_var_name, output_name), outputs))
diff --git a/onnx2fluid/examples/onnx_model_zoo.sh b/onnx2fluid/examples/onnx_model_zoo.sh
index f9c7e9fd1f7fa57e25594d30f42eea27b18b594e..bc47156ace8750ee30c7534308d5de3609c9fe4a 100755
--- a/onnx2fluid/examples/onnx_model_zoo.sh
+++ b/onnx2fluid/examples/onnx_model_zoo.sh
@@ -18,6 +18,7 @@ bvlc_alexnet()
     fn_model="$bn_tar/model.onnx"
 
     http_get "$base_url$fn_tar"
+    rm -rf "$bn_tar/"
     echo "extracting ..."
     tar xf "$fn_tar"
 
@@ -25,7 +26,7 @@ bvlc_alexnet()
     for npz in "$bn_tar"/*.npz
     do
         echo "converting $npz ..."
-        python convert_data_npz_0.py "$npz" data_0 prob_1
+        python convert_data_npz_0.py "$npz" data_0 prob_1 -s
         python -m onnx2fluid.validation $validate_flags1 -t "$npz"
         python -m onnx2fluid.validation $validate_flags2 -t "$npz"
     done
@@ -45,6 +46,7 @@ bvlc_googlenet()
     fn_model="$bn_tar/model.onnx"
 
     http_get "$base_url$fn_tar"
+    rm -rf "$bn_tar/"
     echo "extracting ..."
     tar xf "$fn_tar"
 
@@ -65,6 +67,7 @@ bvlc_reference_caffenet()
     fn_model="$bn_tar/model.onnx"
 
     http_get "$base_url$fn_tar"
+    rm -rf "$bn_tar/"
     echo "extracting ..."
     tar xf "$fn_tar"
 
@@ -85,6 +88,7 @@ bvlc_reference_rcnn_ilsvrc13()
     fn_model="$bn_tar/model.onnx"
 
     http_get "$base_url$fn_tar"
+    rm -rf "$bn_tar/"
     echo "extracting ..."
     tar xf "$fn_tar"
 
@@ -93,8 +97,8 @@ bvlc_reference_rcnn_ilsvrc13()
     do
         echo "converting $pb_dir"
         python convert_data_pb_0.py "$pb_dir" data_0 fc-rcnn_1
-        python -m onnx2fluid.validation $validate_flags1 -t $(dirname "$pb_dir/x").npz
-        python -m onnx2fluid.validation $validate_flags2 -t $(dirname "$pb_dir/x").npz
+        python -m onnx2fluid.validation $validate_flags1 -t $(dirname "$pb_dir/x").npz -p 0
+        python -m onnx2fluid.validation $validate_flags2 -t $(dirname "$pb_dir/x").npz -p 0
     done
 }
 
@@ -105,6 +109,7 @@ inception_v1()
     fn_model="$bn_tar/model.onnx"
 
     http_get "$base_url$fn_tar"
+    rm -rf "$bn_tar/"
     echo "extracting ..."
     tar xf "$fn_tar"
 
@@ -112,7 +117,7 @@ inception_v1()
     for npz in "$bn_tar"/*.npz
     do
         echo "converting $npz ..."
-        python convert_data_npz_0.py "$npz" data_0 prob_1
+        python convert_data_npz_0.py "$npz" data_0 prob_1 -s
         python -m onnx2fluid.validation $validate_flags1 -t "$npz"
         python -m onnx2fluid.validation $validate_flags2 -t "$npz"
     done
@@ -132,6 +137,7 @@ inception_v2()
     fn_model="$bn_tar/model.onnx"
 
     http_get "$base_url$fn_tar"
+    rm -rf "$bn_tar/"
     echo "extracting ..."
     tar xf "$fn_tar"
 
@@ -139,7 +145,7 @@ inception_v2()
     for npz in "$bn_tar"/*.npz
     do
         echo "converting $npz ..."
-        python convert_data_npz_0.py "$npz" data_0 prob_1
+        python convert_data_npz_0.py "$npz" data_0 prob_1 -s
         python -m onnx2fluid.validation $validate_flags1 -t "$npz"
         python -m onnx2fluid.validation $validate_flags2 -t "$npz"
     done
@@ -159,6 +165,7 @@ resnet50()
     fn_model="$bn_tar/model.onnx"
 
     http_get "$base_url$fn_tar"
+    rm -rf "$bn_tar/"
     echo "extracting ..."
     tar xf "$fn_tar"
 
@@ -166,7 +173,7 @@ resnet50()
     for npz in "$bn_tar"/*.npz
     do
         echo "converting $npz ..."
-        python convert_data_npz_0.py "$npz" gpu_0/data_0 gpu_0/softmaxout_1
+        python convert_data_npz_0.py "$npz" gpu_0/data_0 gpu_0/softmaxout_1 -s
         python -m onnx2fluid.validation $validate_flags1 -t "$npz"
         python -m onnx2fluid.validation $validate_flags2 -t "$npz"
     done
@@ -186,6 +193,7 @@ shufflenet()
     fn_model="$bn_tar/model.onnx"
 
     http_get "$base_url$fn_tar"
+    rm -rf "$bn_tar/"
     echo "extracting ..."
     tar xf "$fn_tar"
 
@@ -206,6 +214,7 @@ squeezenet()
     fn_model="$bn_tar/model.onnx"
 
     http_get "$base_url$fn_tar"
+    rm -rf "$bn_tar/"
     echo "extracting ..."
     tar xf "$fn_tar"
 
@@ -226,6 +235,7 @@ tiny_yolov2()
     fn_model="$bn_tar/model.onnx"
 
     http_get "https://onnxzoo.blob.core.windows.net/models/opset_8/tiny_yolov2/$fn_tar"
+    rm -rf "$bn_tar/"
     echo "extracting ..."
     tar xf "$fn_tar"
 
@@ -246,6 +256,7 @@ vgg19()
     fn_model="$bn_tar/model.onnx"
 
     http_get "$base_url$fn_tar"
+    rm -rf "$bn_tar/"
     echo "extracting ..."
     tar xf "$fn_tar"
 
@@ -266,6 +277,7 @@ zfnet512()
     fn_model="$bn_tar/model.onnx"
 
     http_get "$base_url$fn_tar"
+    rm -rf "$bn_tar/"
     echo "extracting ..."
     tar xf "$fn_tar"
 
@@ -288,7 +300,7 @@ inception_v1
 inception_v2
 resnet50
 shufflenet
-squeezenet
-tiny_yolov2 # not supported
+squeezenet # softmax bug
+# tiny_yolov2 # not supported
 vgg19
 zfnet512
diff --git a/onnx2fluid/onnx2fluid/cmdline.py b/onnx2fluid/onnx2fluid/cmdline.py
index 2aa32535a9bff0f3848592d0332654647a631b7c..2067dca55d3c43c2ef48bfd8635080670b1614ad 100644
--- a/onnx2fluid/onnx2fluid/cmdline.py
+++ b/onnx2fluid/onnx2fluid/cmdline.py
@@ -49,7 +49,8 @@ def main(**kwargs):
     basepath, _ = shutil.os.path.splitext(filename)
     save_dir = kwargs.get('output_dir', '')
     # model.onnx -> model/
-    save_dir = (save_dir.rstrip('/') if save_dir else basepath) + '/'
+    save_dir = (save_dir.rstrip(shutil.os.sep)
+                if save_dir else basepath) + shutil.os.sep
     model_basename = DEFAULT_MODEL_MODULE + '.py'
     model_func_name = DEFAULT_MODEL_FUNC
     embed_params = kwargs.get('embed_params', False)
@@ -109,7 +110,7 @@ def main(**kwargs):
     # create zip file
     if archive is not None:
         if archive == '':
-            archive = save_dir.rstrip('/') + '.zip'
+            archive = save_dir.rstrip(shutil.os.sep) + '.zip'
         logger.info('compressing file to %s ...', archive)
         shutil.sys.stderr.write('\n')
         shutil.sys.stderr.flush()
diff --git a/onnx2fluid/onnx2fluid/symbolic.py b/onnx2fluid/onnx2fluid/symbolic.py
index 5e0c82757fbe1a407b0a152adca94862f9c5db16..c2b48e18dc7236828aae7c9861c58a48812859a5 100644
--- a/onnx2fluid/onnx2fluid/symbolic.py
+++ b/onnx2fluid/onnx2fluid/symbolic.py
@@ -69,6 +69,7 @@ DEFAULT_OP_MAPPING = {
         'Sin': ['sin', ['X'], ['Out']],
         'Squeeze': ['squeeze', ['X'], ['Out']], # attrs bypassed, FIXME: emit squeeze2
         'Softplus': ['softplus', ['X'], ['Out']],
+        # FIXME: default axis = -1, reshape required before and after
         'Softmax': ['softmax', ['X'], ['Out'], dict(axis='')],
         'Softsign': ['softsign', ['X'], ['Out']],
         'Sqrt': ['sqrt', ['X'], ['Out']],
@@ -799,7 +800,7 @@ def Constant(prog, inputs, outputs, attrs, value_infos, *args, **kwargs):
         shape = list(value.shape)
         _logger.warning(
             'in (Constant -> %s): '
-            'shape of %s not inferred, '
+            'attribute "shape" of %s not inferred, '
             'using value as 1-D tensor may lead to fails', outputs, val_output)
 
     # generation
@@ -1152,7 +1153,7 @@ def Gemm(prog, inputs, outputs, attrs, value_infos, name, *args, **kwargs):
                     vm_dtype = np.dtype('float32')
                     _logger.warning(
                         'in %s(%s -> Gemm -> %s): '
-                        'beta seems to be an interger, '
+                        'attribute "beta" seems to be an interger, '
                         'however dtype can not be inferred, '
                         'still use float32', name, inputs, outputs)
                 beta = np.dtype(vm_dtype).type(beta)
@@ -1432,9 +1433,17 @@ def Reshape(prog, inputs, outputs, attrs, value_infos, name, *args, **kwargs):
     is_const_shape = shape and 'const_value' in value_infos[val_shape]
     if shape is None:
         shape = _shape_or_none(value_infos, val_reshaped)
-    assert shape is not None, (
-        'given shape is neither const value nor deductible from output, '
-        'this is not supported')
+
+
+#    assert shape is not None, ('given shape is neither const value nor deductible from output, '
+#                               'this is not supported')
+    if shape is None:
+        shape = [1, -1]  # who knows
+        _logger.warning(
+            'in %s(%s -> Reshape -> %s): '
+            'input "shape" not inferred, use [1, -1] as dummy value, '
+            'the behavior of Paddle fluid maybe undefined', name, inputs,
+            outputs)
     fluid_op = 'reshape'
     name_attr = ', name={}'.format(repr(name)) if name else ''
 
@@ -1574,6 +1583,7 @@ def Sum(prog, inputs, outputs, *args, **kwargs):
         '[' + ', '.join(var_inps) + ']',
         # attrs
     ))
+    fluid_op = 'sum'
     prog.VarDesc(var_sum)
     prog.OpDesc(
         fluid_op,