[circle-mlir] Introduce test model for Sign operation

This introduces the test models for Sign operation.
It will be activated after the operation is implemented.

ONE-DCO-1.0-Signed-off-by: Seungho Henry Park <shs.park@samsung.com>

Author: shs-park

circle-mlir/circle-mlir/tools-test/circle-impexp-test/test.lst

@@ -170,6 +170,7 @@ AddModel(Resize_F32_R4_nearest)
 AddModel(Shape_F32_R4)
 AddModel(Sigmoid_F32_R2)
 AddModel(Sigmoid_F32_R4)
+# AddModel(Sign_F32_R4)  # TODO activate after supporting this operation
 AddModel(Sin_F32_R4)
 AddModel(Slice_F32_R2_4) # Rank2 of Slice_F32_R4_4
 AddModel(Slice_F32_R3_4) # Rank3 of Slice_F32_R4_4

circle-mlir/circle-mlir/tools-test/onnx2circle-models/test.lst

@@ -179,6 +179,7 @@ AddModel(Rsqrt_F32_R4)
 AddModel(Shape_F32_R4)
 AddModel(Sigmoid_F32_R2)
 AddModel(Sigmoid_F32_R4)
+# AddModel(Sign_F32_R4)  # TODO activate after supporting this operation
 AddModel(Sin_F32_R4)
 AddModel(Slice_F32_R2_4) # Rank2 of Slice_F32_R4_4
 AddModel(Slice_F32_R3_4) # Rank3 of Slice_F32_R4_4

circle-mlir/circle-mlir/tools-test/onnx2circle-value-test/test.lst

@@ -179,6 +179,7 @@ AddModel(Rsqrt_F32_R4)
 AddModel(Shape_F32_R4)
 AddModel(Sigmoid_F32_R2)
 AddModel(Sigmoid_F32_R4)
+# AddModel(Sign_F32_R4)  # TODO activate after supporting this operation
 AddModel(Sin_F32_R4)
 AddModel(Slice_F32_R2_4) # Rank2 of Slice_F32_R4_4
 AddModel(Slice_F32_R3_4) # Rank3 of Slice_F32_R4_4

circle-mlir/models/unit/Sign_F32_R4/__init__.py

@@ -0,0 +1,19 @@
+import torch
+
+
+# Generate Sign operator with Float32, Rank-4
+class net_Sign(torch.nn.Module):
+    def __init__(self):
+        super().__init__()
+
+    def forward(self, input):
+        return torch.sign(input)
+
+    def onnx_opset_version(self):
+        # TODO set to appropriate value
+        return 14
+
+
+_model_ = net_Sign()
+
+_inputs_ = torch.randn(1, 2, 3, 3)