checker workaround

Author: AyoubMDL

onnxscript/rewriter/matmul_add_to_gemm.py

@@ -7,13 +7,13 @@
 - Add(MatMul(Transpose(X), Transpose(W)), B) -> Gemm
 """
 
-from abc import ABC
+import abc
 from typing import ClassVar
 
 from onnxscript.rewriter import pattern as orp
 
 
-class _MatMulAddToGemmBase(orp.RewriteRuleClassBase, ABC):
+class _MatMulAddToGemmBase(orp.RewriteRuleClassBase, abc.ABC):
     trans_a: ClassVar = False
     trans_b: ClassVar = False
 

onnxscript/rewriter/matmul_add_to_gemm_test.py

@@ -67,6 +67,7 @@ def get_test_model(
             b = ir.tensor(self.rng.uniform(-0.5, 0.5, bias_shape).astype("float32"), name="B")
             b = tape.initializer(b)
 
+        x_t, w_t = None, None
         if transA:
             x_t = tape.op("Transpose", inputs=[x], attributes={"perm": permA})