Replace assertion with ValueError exceptions in run_image_captioning_flax.py (#20365)

* replace 4 asserts with ValueError exception for control flow

* Update examples/flax/image-captioning/run_image_captioning_flax.py
Co-authored-by: Sanchit Gandhi <93869735+sanchit-gandhi@users.noreply.github.com>

* Update examples/flax/image-captioning/run_image_captioning_flax.py
Co-authored-by: Sanchit Gandhi <93869735+sanchit-gandhi@users.noreply.github.com>

* reformatted file

* uninstalled trasformers and applied make style
Co-authored-by: Bibi <Bibi@katies-mac.local>
Co-authored-by: Sanchit Gandhi <93869735+sanchit-gandhi@users.noreply.github.com>

examples/flax/image-captioning/run_image_captioning_flax.py

@@ -298,10 +298,12 @@ class DataTrainingArguments:
         else:
             if self.train_file is not None:
                 extension = self.train_file.split(".")[-1]
-                assert extension in ["csv", "json"], "`train_file` should be a csv or a json file."
+                if extension not in ["csv", "json"]:
+                    raise ValueError(f"`train_file` should be a csv or a json file, got {extension}.")
             if self.validation_file is not None:
                 extension = self.validation_file.split(".")[-1]
-                assert extension in ["csv", "json"], "`validation_file` should be a csv or a json file."
+                if extension not in ["csv", "json"]:
+                    raise ValueError(f"`validation_file` should be a csv or a json file, got {extension}.")
         if self.val_max_target_length is None:
             self.val_max_target_length = self.max_target_length
 
@@ -502,7 +504,12 @@ def main():
     # Get the column names for input/target.
     dataset_columns = image_captioning_name_mapping.get(data_args.dataset_name, None)
     if data_args.image_column is None:
-        assert dataset_columns is not None
+        if dataset_columns is None:
+            raise ValueError(
+                f"`--dataset_name` {data_args.dataset_name} not found in dataset '{data_args.dataset_name}'. Make sure"
+                " to set `--dataset_name` to the correct dataset name, one of"
+                f" {', '.join(image_captioning_name_mapping.keys())}."
+            )
         image_column = dataset_columns[0]
     else:
         image_column = data_args.image_column
@@ -511,7 +518,12 @@ def main():
                 f"--image_column' value '{data_args.image_column}' needs to be one of: {', '.join(column_names)}"
             )
     if data_args.caption_column is None:
-        assert dataset_columns is not None
+        if dataset_columns is None:
+            raise ValueError(
+                f"`--dataset_name` {data_args.dataset_name} not found in dataset '{data_args.dataset_name}'. Make sure"
+                " to set `--dataset_name` to the correct dataset name, one of"
+                f" {', '.join(image_captioning_name_mapping.keys())}."
+            )
         caption_column = dataset_columns[1]
     else:
         caption_column = data_args.caption_column