Use text_column_name variable instead of "text" (#12132)

* Use text_column_name variable instead of "text"

`text_column_name` was already defined above where I made the changes and it was also used below where I made changes.

This is a very minor change. If a dataset does not use "text" as the column name, then the `tokenize_function` will now use whatever column is assigned to `text_column_name`. `text_column_name` is just the first column name if "text" is not a column name. It makes the function a little more robust, though I would assume that 90% + of datasets use "text" anyway.

* black formatting

* make style
Co-authored-by: Nicholas Broad <nicholas@nmbroad.com>

examples/pytorch/language-modeling/run_mlm.py

@@ -345,9 +345,11 @@ def main():
 
         def tokenize_function(examples):
             # Remove empty lines
-            examples["text"] = [line for line in examples["text"] if len(line) > 0 and not line.isspace()]
+            examples[text_column_name] = [
+                line for line in examples[text_column_name] if len(line) > 0 and not line.isspace()
+            ]
             return tokenizer(
-                examples["text"],
+                examples[text_column_name],
                 padding=padding,
                 truncation=True,
                 max_length=max_seq_length,

examples/pytorch/language-modeling/run_mlm_no_trainer.py

@@ -327,9 +327,11 @@ def main():
 
         def tokenize_function(examples):
             # Remove empty lines
-            examples["text"] = [line for line in examples["text"] if len(line) > 0 and not line.isspace()]
+            examples[text_column_name] = [
+                line for line in examples[text_column_name] if len(line) > 0 and not line.isspace()
+            ]
             return tokenizer(
-                examples["text"],
+                examples[text_column_name],
                 padding=padding,
                 truncation=True,
                 max_length=max_seq_length,