Update app.py

app.py

@@ -215,7 +215,7 @@ def get_csv_index(csv_file):
         
         # تقسیم متن‌های طولانی به بخش‌های کوچکتر
         text_splitter = RecursiveCharacterTextSplitter(
-            chunk_size=2048,
+            chunk_size=512,
             chunk_overlap=128,
             length_function=len,
             separators=["\n\n", "\n", " ", ""]
@@ -259,7 +259,7 @@ except Exception as e:
 llm = ChatOpenAI(
     base_url="https://api.together.xyz/v1",
     api_key='0291f33aee03412a47fa5d8e562e515182dcc5d9aac5a7fb5eefdd1759005979',
-    model="deepseek-ai/DeepSeek-R1"
+    model="meta-llama/Llama-4-Maverick-17B-128E-Instruct-FP8"
 )
 
 chain = RetrievalQA.from_chain_type(