[retiarii] support torch 1.8 and 1.9 (#3937)

docs/en_US/NAS/QuickStart.rst

@@ -12,7 +12,7 @@ In this quick start tutorial, we use multi-trial NAS as an example to show how t
 
 One-shot NAS tutorial can be found `here <./OneshotTrainer.rst>`__.
 
-.. note:: Currently, PyTorch is the only supported framework by Retiarii, and we have only tested with **PyTorch 1.6 and 1.7**. This documentation assumes PyTorch context but it should also apply to other frameworks, that is in our future plan.
+.. note:: Currently, PyTorch is the only supported framework by Retiarii, and we have only tested with **PyTorch 1.6 to 1.9**. This documentation assumes PyTorch context but it should also apply to other frameworks, that is in our future plan.
 
 Define your Model Space
 -----------------------

nni/retiarii/operation_def/torch_op_def.py

@@ -59,7 +59,7 @@ class PrimConstant(PyTorchOperation):
     def to_forward_code(self, field: str, output: str, inputs: List[str], inputs_value: List[Any] = None) -> str:
         # TODO: refactor this part, maybe we can remove the code gen of prim::Constant
         # TODO: deal with all the types
-        if self.parameters['type'] == 'None':
+        if self.parameters['type'] in ['None', 'NoneType']:
             return f'{output} = None'
         elif self.parameters['type'] in ('int', 'float', 'bool', 'int[]'):
             return f'{output} = {self.parameters["value"]}'
@@ -238,7 +238,13 @@ class AtenIndex(PyTorchOperation):
 
 ManuallyChooseDef = {
     'aten::flatten': [('start_dim', 'int', '0'), ('end_dim', 'int', '-1')],
-    'aten::split': [('split_size', 'int', 'None'), ('dim', 'int', '0')]
+    'aten::split': [('split_size', 'int', 'None'), ('dim', 'int', '0')],
+    # in v1.9 dtype is supported as input argument for view, but torch script does not support it
+    'aten::view': [('size', 'List[int]', 'None')],
+    # NOTE: dim supports different types: List[int], List[str], Optional[List[int]], now we only support the first two, refactor needed
+    # torch.std(input, dim, unbiased, keepdim=False, *, out=None)  Tensor
+    # torch.std(input, unbiased)  Tensor
+    'aten::std': [('dim', 'List[int]', 'None'), ('unbiased', 'bool', 'True'), ('keepdim', 'bool', 'False')]
 }
 
 TensorOpExceptions = {
@@ -426,4 +432,11 @@ class AtenAvgpool2d(PyTorchOperation):
     # NOTE: it is not included in the above aten ops for unkown reason
     _ori_type_name = ['aten::avg_pool2d']
     def to_forward_code(self, field: str, output: str, inputs: List[str], inputs_value: List[Any] = None) -> str:
-        return f'{output} = F.avg_pool2d({", ".join(inputs)})'
\ No newline at end of file
+        return f'{output} = F.avg_pool2d({", ".join(inputs)})'
+
+class AtenDet(PyTorchOperation):
+    # for torch 1.9
+    # NOTE: it is not included in the above aten ops, maybe because torch.det is alias for torch.linalg.det
+    _ori_type_name = ['aten::linalg_det']
+    def to_forward_code(self, field: str, output: str, inputs: List[str], inputs_value: List[Any] = None) -> str:
+        return f'{output} = torch.det({inputs[0]})'
\ No newline at end of file

test/ut/retiarii/test_convert_pytorch.py

@@ -375,7 +375,7 @@ class TestPytorch(unittest.TestCase):
     # NOTE: torch script gets an incorrect graph...
     def test_optional_inputs_with_mixed_optionals(self):
         class MixedModel(nn.Module):
-            def forward(self, x: 'Tensor', y: 'Tensor', z: 'Tensor'):
+            def forward(self, x, y, z):
                 if y is not None:
                     return x + y
                 if z is not None: