Fix more LINT errors

python/tvm/relax/transform/optimize_layout_transform.py

@@ -14,13 +14,12 @@
 # KIND, either express or implied.  See the License for the
 # specific language governing permissions and limitations
 # under the License.
-# pylint: disable=invalid-name, unused-argument
+# pylint: disable=invalid-name, unused-argument, redefined-argument-from-local
 """Relax Optimize Layout Transform pass."""
-import tvm
 from tvm.ir.module import IRModule
 from tvm.ir.transform import PassContext
 from tvm.relax import Expr, Function
-from tvm.relax.dpl import *
+from tvm.relax.dpl import is_op, rewrite_call, wildcard
 from . import function_pass
 
 
@@ -29,18 +28,6 @@ class OptimizeLayoutTransform:
     """
     Pass to remove redundant transform layout operators
     introduced by AlterOpImpl pass.
-
-    Parameters
-    ----------
-    func: Expr
-        The relax function to be optimized
-
-    mod: IRModule
-        The ir module
-
-    ctx: PassContext
-        Relax pass context
-
     """
 
     def __init__(self):
@@ -51,9 +38,23 @@ def __init__(self):
         self.pattern = pattern_1
 
     def transform_function(self, func: Expr, mod: IRModule, ctx: PassContext) -> IRModule:
+        """
+        Tranformation function to pattern match layout_transform -> layout_transform
+        pattern
+
+        Parameters
+        ----------
+        func: Expr
+            The relax function to be optimized
+
+        mod: IRModule
+            The ir module
 
+        ctx: PassContext
+            Relax pass context
+        """
         updated_func = func
-        for global_var, func in mod.functions.items():
+        for _, func in mod.functions.items():
             # Skip non-relax functions
             if not isinstance(func, Function):
                 continue
@@ -66,6 +67,7 @@ def rewriter(expr, matches):
                 arg2 = matches[self.input]
                 if list(arg1.struct_info.shape) == list(arg2.struct_info.shape):
                     return arg2
+                return expr
 
             updated_func = rewrite_call(self.pattern, rewriter, func)