Update app/backend/requirements.txt

app/backend/requirements.txt

@@ -1,9 +1,10 @@
-fastapi==0.104.1
-uvicorn==0.24.0
-torch==2.2.0
-transformers>=4.35.2
-safetensors>=0.4.16
-python-dotenv==1.0.0
-httpx==0.25.1
-pydantic==2.5.0
-psutil==5.9.6
+fastapi==0.104.1
+uvicorn==0.24.0
+torch==2.2.0
+transformers>=4.35.2
+safetensors>=0.4.16
+python-dotenv==1.0.0
+httpx==0.25.1
+pydantic==2.5.0
+psutil==5.9.6
+sentencepiece==0.1.99