[OV] Raise exception when some compression parameter is given, but weight format is not

optimum/commands/export/openvino.py

@@ -262,8 +262,9 @@ def run(self):
         if self.args.weight_format is None:
             ov_config = None
             if not no_compression_parameter_provided(self.args):
-                logger.warning(
-                    "The provided compression parameters will not affect conversion because of the missing --weight-format argument."
+                raise ValueError(
+                    "Some compression parameters are provided, but the weight format is not specified. "
+                    "Please provide it with --weight-format argument."
                 )
         elif self.args.weight_format in {"fp16", "fp32"}:
             ov_config = OVConfig(dtype=self.args.weight_format)

tests/openvino/test_exporters_cli.py

@@ -384,3 +384,20 @@ def test_exporters_cli_open_clip(self):
             model = eval(_HEAD_TO_AUTOMODELS["open_clip"]).from_pretrained(tmpdir, compile=False)
             self.assertTrue("text_features" in model.text_model.output_names)
             self.assertTrue("image_features" in model.visual_model.output_names)
+
+    def test_export_openvino_with_missed_weight_format(self):
+        # Test that exception is raised when some compression parameter is given, but weight format is not.
+        with TemporaryDirectory() as tmpdir:
+            with self.assertRaises(subprocess.CalledProcessError) as exc_info:
+                subprocess.run(
+                    f"optimum-cli export openvino --model {MODEL_NAMES['gpt2']} --task text-generation --sym {tmpdir}",
+                    shell=True,
+                    check=True,
+                    stdout=subprocess.PIPE,
+                    stderr=subprocess.PIPE,
+                    text=True,
+                )
+            self.assertIn(
+                "Some compression parameters are provided, but the weight format is not specified.",
+                str(exc_info.exception.stderr),
+            )