Unified error handling in NNVM and Relay frontends

nnvm/python/nnvm/frontend/caffe2.py

@@ -3,7 +3,7 @@
 from __future__ import absolute_import as _abs
 import tvm
 from nnvm import symbol as _sym
-from nnvm.frontend.common import get_nnvm_op, Renamer, AttrConverter as AttrCvt
+from .common import get_nnvm_op
 from .onnx_caffe2_utils import dimension_picker, dimension_constraint, infer_channels, revert_caffe2_pad
 from . import onnx
 
@@ -73,8 +73,8 @@ def get_converter(cls):
 
         if hasattr(cls, '_impl'):
             return getattr(cls, '_impl')
-        raise NotImplementedError('{} not implemented'.format(
-            cls.__name__))
+        raise tvm.error.OpNotImplemented(
+            'Operator {} is not implemented in frontend Caffe2.'.format(cls.__name__))
 
 
 _caffe2_internal_args = {
@@ -176,8 +176,7 @@ def _get_axis_from_order_str(order):
                 return 1
             if order == 'NHWC':
                 return 3
-            raise RuntimeError(
-                "Unsupported storage order: {} in caffe2".format(order))
+            raise tvm.error.OpAttributeInvalid('Value {} in attribute {} of operator {} is not valid.'.format(order, 'order', 'Concat'))
 
         return AttrCvt(
             op_name='concatenate',
@@ -427,8 +426,8 @@ def _convert_operator(self,
             # Add a sanitizing step to convert all byte strings in args to strings
             sym = convert_map[op_type](inputs, args, self._params)
         else:
-            raise NotImplementedError(
-                "Operator {} not implemented.".format(op_type))
+            raise tvm.error.OpNotImplemented(
+                'Operator {} is not supported in frontend Caffe2.'.format(op_type))
         return sym
 
 

nnvm/python/nnvm/frontend/common.py

@@ -7,9 +7,25 @@
 def get_nnvm_op(op_name):
     op = getattr(_sym, op_name)
     if not op:
-        raise RuntimeError("Unable to map op_name {} to nnvm.sym".format(op_name))
+        raise OpNotImplemented(
+            'Operator {} is not supported.'.format(op))
     return op
 
+def required_attr(attr, key, op_name):
+    assert isinstance(attr, dict)
+    if key not in attr:
+        raise OpAttributeRequired(
+            'Required attribute {} not found in operator {}'.format(key, op_name))
+    return attr[key]
+
+def parse_tshape(tshape):
+    """Parse tshape in string."""
+    return [int(x.strip()) for x in tshape.strip('()').split(',')]
+
+def parse_bool_str(attr, key, default='False'):
+    """Parse bool string to boolean."""
+    return attr.get(key, default).strip().lower() in ['true', '1', 't', 'y', 'yes']
+
 class Renamer(object):
     """A simply renamer for operators.
 

nnvm/python/nnvm/frontend/coreml.py

@@ -2,11 +2,10 @@
 """CoreML frontend."""
 from __future__ import absolute_import as _abs
 import numpy as np
-
 import tvm
+from .common import SymbolTable
 from .. import symbol as _sym
 from .._base import string_types
-from .common import SymbolTable
 
 __all__ = ['from_coreml']
 
@@ -83,7 +82,8 @@ def BatchnormLayerParams(op, insym, symtab):
     """Get layer of batchnorm parameter"""
     # this changes the symbol
     if op.instanceNormalization:
-        raise NotImplementedError("instance normalization not implemented")
+        msg = 'Operator "instance normalization" is not supported in frontend CoreML.'
+        raise tvm.error.OpNotImplemented(msg)
     else:
         params = {'gamma':symtab.new_const(list(op.gamma.floatValue)),
                   'beta':symtab.new_const(list(op.beta.floatValue)),
@@ -136,7 +136,8 @@ def ActivationParams(op, insym, symtab):
         betasym = symtab.new_const(beta)
         return _sym.broadcast_mul(_sym.log(_sym.broadcast_add(
             _sym.exp(insym), betasym)), alphasym)
-    raise NotImplementedError('%s not implemented' % whichActivation)
+    raise tvm.error.OpNotImplemented(
+        'Operator {} is not supported in frontend CoreML.'.format(whichActivation))
 
 def ScaleLayerParams(op, insym, symtab):
     """Scale layer params."""
@@ -158,7 +159,8 @@ def PoolingLayerParams(op, insym, symtab):
             return _sym.global_max_pool2d(insym)
         if op.type == 1:
             return _sym.global_avg_pool2d(insym)
-        raise NotImplementedError("Only max and average pooling implemented")
+        raise tvm.error.OpNotImplemented(
+            'Operator pooling (not max or average) is not supported in frontend CoreML.')
 
     else:
         params = {'pool_size':list(op.kernelSize),
@@ -178,7 +180,8 @@ def PoolingLayerParams(op, insym, symtab):
             params['padding'] = padding
             params['ceil_mode'] = True
         else:
-            raise NotImplementedError("Other convolution padding not implemented")
+            msg = 'Value {} in attribute PoolingPaddingType of operator Pooling is not valid.'
+            raise tvm.error.OpAttributeInvalid(msg.format(op.WhichOneof('PoolingPaddingType')))
 
         # consume padding layer
         if symtab.in_padding:
@@ -190,7 +193,8 @@ def PoolingLayerParams(op, insym, symtab):
             return _sym.max_pool2d(insym, **params)
         if op.type == 1:
             return _sym.avg_pool2d(insym, **params)
-        raise NotImplementedError("Only max and average pooling implemented")
+        msg = 'Operator pooling (not max or average) is not supported in frontend CoreML.'
+        raise tvm.error.OpNotImplemented(msg)
 
 def SoftmaxLayerParams(op, insym, symtab):
     return _sym.softmax(_sym.flatten(insym))
@@ -229,7 +233,8 @@ def ConcatLayerParams(op, insyms, symtab):
     if not isinstance(insyms, list):
         insyms = [insyms]
     if op.sequenceConcat:
-        raise NotImplementedError("Sequence Concat not supported")
+        raise tvm.error.OpNotImplemented(
+            'Operator Sequence Concat is not supported in frontend CoreML.')
     ret = _sym.concatenate(*insyms, axis=1)
     return ret
 
@@ -243,14 +248,16 @@ def PaddingLayerParams(op, insym, symtab):
     if op.WhichOneof('PaddingType') == 'constant':
         constant = op.constant
         if constant.value != 0:
-            raise NotImplementedError("Padding value {} not supported.".format(constant.value))
+            msg = 'Value {} in attribute "padding value" of operator Padding is not valid.'
+            raise tvm.error.OpAttributeInvalid(msg.format(constant.value))
         padding = [b.startEdgeSize for b in op.paddingAmounts.borderAmounts]
         padding2 = [b.endEdgeSize for b in op.paddingAmounts.borderAmounts]
         for i, j in zip(padding, padding2):
             assert i == j
         symtab.set_padding(padding)
     else:
-        raise NotImplementedError("Only constant padding is supported now.")
+        raise tvm.error.OpNotImplemented(
+            'Operator "non-constant padding" is not supported in frontend CoreML.')
     return insym
 
 def PermuteLayerParams(op, insym, symtab):
@@ -259,8 +266,8 @@ def PermuteLayerParams(op, insym, symtab):
 
 def UpsampleLayerParams(op, insym, symtab):
     if op.scalingFactor[0] != op.scalingFactor[1]:
-        raise NotImplementedError("Upsampling only supported with same \
-            height and width scaling factor.")
+        raise tvm.error.OpAttributeInvalid(
+            'Height and width scaling factors of Upsample operator must be equal.')
     interpolationMode = 'NEAREST_NEIGHBOR' if op.mode == 0 else 'BILINEAR'
     return _sym.upsampling(insym, scale=op.scalingFactor[0], method=interpolationMode)
 
@@ -341,7 +348,8 @@ def coreml_op_to_nnvm(op, inname, outname, symtab):
     """
     classname = type(op).__name__
     if classname not in _convert_map:
-        raise NotImplementedError("%s is not supported" % (classname))
+        raise tvm.error.OpNotImplemented(
+            'Operator {} is not supported in frontend CoreML.'.format(classname))
     if isinstance(inname, string_types):
         insym = symtab.get_var(inname)
     else: