Update pdf_processor.py

pdf_processor.py

@@ -6,10 +6,14 @@ from llm import get_llm
 llm = get_llm()
 
 def extract_answers_from_pdf(pdf_path: str) -> ExtractionResult:
+    """
+    Loads a PDF, extracts its content, and uses the LLM to output a JSON of the answers.
+    """
     loader = PyPDFLoader(pdf_path)
     pages = loader.load_and_split()
     all_page_content = "\n".join(page.page_content for page in pages)
     
+    # Prepare the prompt with the JSON schema.
     extraction_schema = ExtractionResult.model_json_schema()
     system_message = (
         "You are a document analysis tool that extracts the options and correct answers from the provided document content. "
@@ -26,6 +30,9 @@ def extract_answers_from_pdf(pdf_path: str) -> ExtractionResult:
     return result
 
 def evaluate_student(answer_key: ExtractionResult, student: ExtractionResult) -> EvaluationResult:
+    """
+    Compares the answer key with a student's answers and returns the evaluation result.
+    """
     evaluation_schema = EvaluationResult.model_json_schema()
     system_message = (
         "You are an academic evaluation tool that compares the answer key with a student's answers. "