Add missing converter for _local_scalar_dense (#2367)

Author: xadupre

onnxscript/function_libs/torch_lib/ops/core.py

@@ -61,20 +61,18 @@
 Rank = common_ops.Rank
 
 
-@torch_op("aten::_local_scalar_dense")
-def aten__local_scalar_dense(self: Union[FLOAT16, FLOAT, DOUBLE, BFLOAT16]) -> FLOAT:
+@torch_op("aten::_local_scalar_dense", trace_only=True)
+def aten__local_scalar_dense(self: TensorType) -> TensorType:
     """_local_scalar_dense(Tensor self) -> Scalar"""
 
     # Return the first element in tensor as a scalar.
-    return op.Cast(op.Gather(op.Reshape(self, [-1]), 0), to=FLOAT.dtype)
-
-
-@torch_op("aten::_local_scalar_dense")
-def aten__local_scalar_dense_int(self: IntType) -> INT64:
-    """_local_scalar_dense(Tensor self) -> Scalar"""
-
-    # Return the first element in tensor as a scalar.
-    return op.Cast(op.Gather(op.Reshape(self, [-1]), 0), to=INT64.dtype)
+    if self.dtype.is_floating_point():
+        dtype = ir.DataType.FLOAT
+    elif self.dtype == ir.DataType.BOOL:
+        dtype = ir.DataType.BOOL
+    else:
+        dtype = ir.DataType.INT64
+    return op.Cast(op.Gather(op.Reshape(self, [-1]), 0), to=dtype)
 
 
 @torch_op("aten::_log_softmax", trace_only=True)

tests/function_libs/torch_lib/extra_opinfo.py

@@ -2308,7 +2308,7 @@ def __init__(self):
     opinfo_core.OpInfo(
         "ops.aten._local_scalar_dense",
         aten_name="_local_scalar_dense",
-        dtypes=common_dtype.all_types(),
+        dtypes=common_dtype.all_types_and(torch.bool),
         sample_inputs_func=sample_inputs__local_scalar_dense,
         supports_out=False,
     ),