[`Quantization`] Add str to enum conversion for AWQ (#27320)

* add str to enum conversion

* fixup

* Apply suggestions from code review
Co-authored-by: amyeroberts <22614925+amyeroberts@users.noreply.github.com>

---------
Co-authored-by: amyeroberts <22614925+amyeroberts@users.noreply.github.com>

src/transformers/utils/quantization_config.py

@@ -44,6 +44,16 @@ class AWQLinearVersion(str, Enum):
     GEMM = "gemm"
     GEMV = "gemv"
 
+    @staticmethod
+    def from_str(version: str):
+        version = version.lower()
+        if version == "gemm":
+            return AWQLinearVersion.GEMM
+        elif version == "gemv":
+            return AWQLinearVersion.GEMV
+        else:
+            raise ValueError(f"Unknown AWQLinearVersion {version}")
+
 
 class AwqBackendPackingMethod(str, Enum):
     AUTOAWQ = "autoawq"
@@ -566,6 +576,7 @@ class AwqConfig(QuantizationConfigMixin):
                 f"Only supported quantization backends in {AwqBackendPackingMethod.AUTOAWQ} and {AwqBackendPackingMethod.LLMAWQ} - not recognized backend {self.backend}"
             )
 
+        self.version = AWQLinearVersion.from_str(self.version)
         if self.version not in [AWQLinearVersion.GEMM, AWQLinearVersion.GEMV]:
             raise ValueError(
                 f"Only supported versions are in [AWQLinearVersion.GEMM, AWQLinearVersion.GEMV] - not recognized version {self.version}"

tests/quantization/autoawq/test_awq.py

@@ -47,6 +47,13 @@ class AwqConfigTest(unittest.TestCase):
         with self.assertRaises(ValueError):
             AwqConfig(bits=4, backend="")
 
+        # These should work fine
+        _ = AwqConfig(bits=4, version="GEMM")
+        _ = AwqConfig(bits=4, version="gemm")
+
+        with self.assertRaises(ValueError):
+            AwqConfig(bits=4, backend="unexisting-backend")
+
         # LLMAWQ does not work on a T4
         with self.assertRaises(ValueError):
             AwqConfig(bits=4, backend="llm-awq")