Address comments

* Remove unused code
* Add negative test case

Change-Id: I5e12d070554954e320b4d15c02d5e2ada179fce5

python/tvm/relay/op/contrib/ethosn.py

@@ -101,18 +101,6 @@ def is_inline_non_compute_intensive_partitions_enabled() -> bool:
     return compiler_attrs.inline_non_compute_intensive_partitions
 
 
-def is_experimental_compiler_enabled() -> bool:
-    """
-    Determine whether the experimental compiler option is enabled.
-
-    Returns
-    -------
-    True if the experimental compiler is enabled, False if not.
-    """
-    compiler_attrs = tvm.get_global_func("relay.ext.ethos-n.get_compiler_attrs")()
-    return compiler_attrs.experimental_compiler
-
-
 def partition_for_ethosn(mod, params=None, **opts):
     """Partition the graph greedily offloading supported
     operators to Arm Ethos-N NPU.

tests/python/contrib/test_ethosn/test_codegen.py

@@ -77,3 +77,30 @@ def test_experimental_compiler(capfd):
     assert (
         "WARNING: Experimental Compiler in use." in captured.err
     ), "Experimental compiler was not activated."
+
+
+@requires_ethosn
+def test_without_experimental_compiler(capfd):
+    """Test compilation when the experimental compiler is not enabled."""
+    dtype = "int8"
+    input_shape = (1, 2, 2, 2)
+
+    x = relay.var("x", shape=input_shape, dtype=dtype)
+    y = relay.reshape(x, newshape=(1, 1, 1, 8))
+    mod = tei.make_ethosn_partition(y)
+
+    additional_config_args = {
+        "variant": "n78",
+        "experimental_compiler": False,
+        "inline_non_compute_intensive_partitions": False,
+    }
+
+    tei.build(mod, {}, True, additional_config_args=additional_config_args)
+
+    # Check for hints that the experimental compiler was activated.
+    # The support library logs a warning to say the the experimental
+    # compiler is in use. Check that this warning was logged.
+    captured = capfd.readouterr()
+    assert (
+        "WARNING: Experimental Compiler in use." not in captured.err
+    ), "Experimental compiler was enabled when it is not expected to be."