[ADD] forget to add tools/summarizer_service.py now adding.

tools/summarizer_service.py

@@ -0,0 +1,24 @@
+from transformers import pipeline
+from functools import lru_cache
+
+class SummarizerService:
+    _instance = None
+    
+    def __new__(cls):
+        if cls._instance is None:
+            cls._instance = super().__new__(cls)
+            # Initialize the summarizer only once
+            cls._instance.summarizer = pipeline("summarization", model="google/flan-t5-small")
+        return cls._instance
+    
+    def summarize(self, text, ratio=0.5, min_length=30):
+        # Calculate dynamic max_length based on input length
+        input_length = len(text.split())
+        max_length = max(int(input_length * ratio), min_length)
+        
+        return self.summarizer(
+            text,
+            max_length=max_length,
+            min_length=min_length,
+            do_sample=False
+        )[0]['summary_text']