Update app.py

app.py

@@ -215,8 +215,8 @@ def get_csv_index(csv_file):
         
         # تقسیم متن‌های طولانی به بخش‌های کوچکتر
         text_splitter = RecursiveCharacterTextSplitter(
-            chunk_size=2048,
-            chunk_overlap=256,
+            chunk_size=5000,
+            chunk_overlap=512,
             length_function=len,
             separators=["\n\n", "\n", " ", ""]
         )
@@ -227,7 +227,7 @@ def get_csv_index(csv_file):
 
         # ایجاد embeddings
         embeddings = TogetherEmbeddings(
-            model_name="togethercomputer/m2-bert-80M-8k-retrieval",
+            model_name="meta-llama/Llama-4-Maverick-17B-128E-Instruct-FP8",
             api_key="0291f33aee03412a47fa5d8e562e515182dcc5d9aac5a7fb5eefdd1759005979"
         )
 
@@ -259,7 +259,7 @@ except Exception as e:
 llm = ChatOpenAI(
     base_url="https://api.together.xyz/v1",
     api_key='0291f33aee03412a47fa5d8e562e515182dcc5d9aac5a7fb5eefdd1759005979',
-    model="meta-llama/Llama-3.3-70B-Instruct-Turbo-Free"
+    model="deepseek-ai/DeepSeek-R1"
 )
 
 chain = RetrievalQA.from_chain_type(