support get_item where the index is a bool scalar tensor

[FlyingQianMM]

PR types

Bug fixes

PR changes

OPs

Describe

• get_item() raise a error as bellow when the index is a bool scalar tensor:

code:

import paddle
data = paddle.to_tensor([[1,2]])
mask = paddle.to_tensor([1], dtype='bool')
print(data[mask])

error:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/opt/conda/lib/python3.7/site-packages/paddle/fluid/dygraph/varbase_patch_methods.py", line 719, in __getitem__
    return _getitem_impl_(self, item)
  File "/opt/conda/lib/python3.7/site-packages/paddle/fluid/variable_index.py", line 474, in _getitem_impl_
    attrs=attrs)
  File "/opt/conda/lib/python3.7/site-packages/paddle/fluid/framework.py", line 3480, in append_op
    inplace_map)
  File "/opt/conda/lib/python3.7/site-packages/paddle/fluid/dygraph/tracer.py", line 130, in trace_op
    not stop_gradient, inplace_map if inplace_map else {})
ValueError: (InvaidArgument) The dtype of Tensor in list must be int32 or int64, but received: 0 (at /idg/paddle/Paddle/paddle/fluid/operators/utils.h:87)
  [operator < slice > error]

• after we fix this error, the output can been returned correctly:
  code:

import paddle
data = paddle.to_tensor([[1,2]])
mask = paddle.to_tensor([1], dtype='bool')
print(data[mask])