Support dashed arguments for benchmark args

Signed-off-by: Samuel Monson <smonson@redhat.com>
Signed-off-by: Alon Kellner <akellner@redhat.com>

Author: sjmonson

src/guidellm/benchmark/schemas.py

@@ -24,6 +24,8 @@
 
 import yaml
 from pydantic import (
+    AliasChoices,
+    AliasGenerator,
     ConfigDict,
     Field,
     ValidationError,
@@ -1885,12 +1887,7 @@ def get_default(cls: type[BenchmarkGenerativeTextArgs], field: str) -> Any:
     data_request_formatter: DatasetPreprocessor | dict[str, str] | str = Field(
         default="chat_completions",
         description="Request formatting preprocessor or template name",
-        validation_alias=AliasChoices(
-            "data_request_formatter",
-            "data-request-formatter",
-            "request_type",
-            "request-type",
-        ),
+        validation_alias=AliasChoices("request_type", "request-type"),
     )
     data_collator: Callable | Literal["generative"] | None = Field(
         default="generative", description="Data collator for batch processing"