diff --git a/python/nnvm/frontend/onnx.py b/python/nnvm/frontend/onnx.py
index 667c1787b..fcd15db1f 100644
--- a/python/nnvm/frontend/onnx.py
+++ b/python/nnvm/frontend/onnx.py
@@ -3,6 +3,8 @@
 from __future__ import absolute_import as _abs
 import tvm
 from .. import symbol as _sym
+from .. import graph as _graph
+from .. compiler import graph_util
 from .common import Renamer, AttrConverter as AttrCvt
 
 __all__ = ['from_onnx']
@@ -60,9 +62,9 @@ def _pooling(name):
             'kernel_shape': 'pool_size',
             'pads': ('padding', (0, 0), _revert_caffe2_pad)},
         # very weird attributes here in onnx, force check
-        excludes=['dilations'],
+        ignores=['dilations'],
         # TODO(zhreshold): make sure ceil_mode in onnx, and layout?
-        extras={'ceil_mode': True},
+        extras={'ceil_mode': False},
         custom_check=_dimension_constraint())
 
 def _conv():
@@ -90,7 +92,7 @@ def _batch_norm():
     return AttrCvt(
         op_name='batch_norm',
         disables=['momentum'],
-        ignores=['spatial', 'is_test'])
+        ignores=['spatial', 'is_test', 'consumed_inputs'])
 
 
 # compatible operators that do NOT require any conversion.
@@ -100,6 +102,7 @@ def _batch_norm():
 _convert_map = {
     # defs/experimental
     'FC'            : AttrCvt('dense', ignores=['axis', 'axis_w']),
+    'SpatialBN'     : _batch_norm(),
 
     # defs/generator
     # 'Constant'
@@ -200,7 +203,7 @@ def _convert_operator(op_name, attrs, identity_list=None, convert_map=None):
     elif op_name in convert_map:
         op_name, attrs = convert_map[op_name](attrs)
     else:
-        _raise_not_supported('Operator: ' + op_name)
+        raise NotImplementedError("Operator {} not implemented.".format(op_name))
     op = getattr(_sym, op_name, None)
     if not op:
         raise RuntimeError("Unable to map op_name {} to nnvm.sym".format(op_name))
@@ -267,10 +270,11 @@ def from_onnx(self, graph):
             new_attr = self._fix_channels(new_op, new_attr, list(node.input))
             self._fix_bias_shape(node.op_type, graph.node[idx-1].op_type, node.input)
             op = new_op(name=node_name, *inputs, **new_attr)
-            assert len(node.output) == len(op.list_output_names()), (
-                "Number of output mismatch {} vs {}.".format(
-                    len(node.output), len(op.list_output_names())))
-            for k, i in zip(list(node.output), range(len(node.output))):
+            node_output = self._fix_outputs(op_name, node.output)
+            assert len(node_output) == len(op.list_output_names()), (
+                "Number of output mismatch {} vs {} in {}.".format(
+                    len(node_output), len(op.list_output_names()), op_name))
+            for k, i in zip(list(node_output), range(len(node_output))):
                 self._nodes[k] = op[i]
         # now return the outputs
         out = [self._nodes[i] for i in graph.output]
@@ -310,6 +314,15 @@ def _parse_attr(self, attr_proto):
                 raise ValueError("Cannot parse attribute: \n{}\n.".format(a))
         return attrs
 
+    def _fix_outputs(self, op, outputs):
+        """A hack to handle dropout or similar operator that have more than one out
+        in ONNX.
+        """
+        if op == 'Dropout':
+            assert len(outputs) == 2, "ONNX have two outputs for dropout layer."
+            outputs = outputs[:-1]
+        return outputs
+
     def _fix_bias(self, op, attrs, num_inputs):
         """A hack for 'use_bias' attribute since onnx don't provide this attribute,
         we have to check the number of inputs to decide it."""
@@ -340,17 +353,24 @@ def _fix_channels(self, op, attrs, inputs):
         """
         if op not in [_sym.conv2d, _sym.conv2d_transpose, _sym.dense]:
             return attrs
-        weight_name = self._renames[inputs[1]]
-        if not weight_name in self._params:
-            raise ValueError("Unable to get channels/units attr from onnx graph.")
+        if inputs[1] not in self._renames:
+            assert inputs[1] in self._nodes
+            g = _graph.create(self._nodes[inputs[1]])
+            shape_dict = {k: v.shape for k, v in self._params.items()}
+            _, out_shapes = graph_util.infer_shape(g, **shape_dict)
+            channels = out_shapes[0][0]
         else:
-            wshape = self._params[weight_name].shape
-            assert len(wshape) >= 2, "Weights shape is invalid: {}".format(wshape)
-            channels = wshape[0]
-            if op in [_sym.dense]:
-                attrs['units'] = channels
+            weight_name = self._renames[inputs[1]]
+            if not weight_name in self._params:
+                raise ValueError("Unable to get channels/units attr from onnx graph.")
             else:
-                attrs['channels'] = channels
+                wshape = self._params[weight_name].shape
+                assert len(wshape) >= 2, "Weights shape is invalid: {}".format(wshape)
+                channels = wshape[0]
+        if op in [_sym.dense]:
+            attrs['units'] = channels
+        else:
+            attrs['channels'] = channels
         return attrs
 
 def from_onnx(graph):