fix: mistral evaluator output format

model/mistral_7b_ielts_evaluator.py

@@ -58,7 +58,10 @@ def grade_mistral_7b_ielts_evaluator(question: str, answer: str) -> Tuple[float,
 ## Evaluation:
 """
 
-    outputs = pipe(text, max_length=1024)
-    overall_score = float(0.0)
+    outputs = pipe(text, max_length=2048)
+    comment = outputs[0]["generated_text"].split("## Evaluation:")[1].strip()
+    overall_score = float(
+        comment.split("Suggested Overall Band Score: ")[1].split("\n")[0] or 0.0
+    )
 
-    return overall_score, outputs
+    return overall_score, comment