!12902 【GraphKernel】Add OpInfer for op Select

From: @dayschan
Reviewed-by: @gaoxiong1,@dylangeng
Signed-off-by: @gaoxiong1

mindspore/_extends/graph_kernel/model/op_infer.py

@@ -273,3 +273,14 @@ class Greater(_CompareOp):
 
 class GreaterEqual(_CompareOp):
     pass
+
+
+class Select(_Elemwise):
+    def _check_type(self):
+        if self.inputs[0].dtype != "bool":
+            raise GKException("Select's input[0] should be a bool condition but got {}".format(self.inputs[0].dtype))
+        if self.inputs[1].dtype != self.inputs[2].dtype:
+            raise GKException("Select's input mismatch ({} vs {})".format(self.inputs[1].dtype, self.inputs[2].dtype))
+
+    def _infer_type(self):
+        return self.inputs[1].dtype