remove uneccesary function

Change-Id: Ifc1b4c34cd891fce35d3e043ba81afdd2e34fc4e

Author: lhutton1

python/tvm/relay/backend/contrib/ethosu/codegen.py

@@ -25,7 +25,6 @@
 from tvm.relay.backend.contrib.ethosu import tir_to_cs_translator
 from tvm.relay.backend.contrib.ethosu import util
 from tvm.relay.backend.contrib.ethosu import op as ethosu_op
-from tvm.relay.backend.contrib.ethosu.util import is_ethosu_op
 from tvm.relay.expr_functor import ExprMutator
 from tvm.relay.backend.contrib.ethosu.op import op_attrs  # pylint: disable=unused-import
 
@@ -168,7 +167,7 @@ def visit_call(self, call: tvm.relay.expr.Call) -> tvm.relay.expr.Call:
             not refer to an Op. Else, a new call node with altered Op
             attributes.
         """
-        if is_ethosu_op(call) and call.op.name != "contrib.ethosu.identity":
+        if isinstance(call.op, tvm.ir.op.Op) and call.op.name in self.optimize_op:
             return self.alter_ethosu_op_layout(call)
         return super().visit_call(call)
 

python/tvm/relay/backend/contrib/ethosu/util.py

@@ -139,26 +139,6 @@ def is_composite_func(func: relay.Function, name: str) -> bool:
     return composite_name == name
 
 
-def is_ethosu_op(expr: tvm.relay.Expr) -> bool:
-    """Checks whether a relay expression is an NPU operator or not.
-
-    Parameters
-    ----------
-    expr : tvm.relay.Expr
-        The expression to check.
-
-    Returns
-    -------
-    bool
-        True if the expression is an EthosU operation, false if not.
-    """
-    return (
-        isinstance(expr, tvm.relay.expr.Call)
-        and isinstance(expr.op, tvm.ir.op.Op)
-        and "contrib.ethosu" in expr.op.name
-    )
-
-
 def get_range_for_dtype_str(dtype: str) -> Tuple[int, int]:
     """
     Produce the min,max for a give data type.