remove unnecessary transformers dependency

retrieval.py

@@ -1,8 +1,4 @@
-import json
 import os
-import pathlib
-import sys
-import time
 from typing import Any, Dict, List
 
 # for vector search
@@ -10,23 +6,17 @@ import pinecone  # cloud-hosted vector database for context retrieval
 # for auto-gpu selection
 from langchain.embeddings import HuggingFaceEmbeddings
 from langchain.vectorstores import Pinecone
-from PIL import Image
-
-from transformers import (AutoModelForSequenceClassification, AutoTokenizer,
-                          GPT2Tokenizer, OPTForCausalLM,
-                          T5ForConditionalGeneration)
 
 # load custom code
-sys.path.append("../ai-teaching-assistant-uiuc")
+from clip_for_ppts import ClipImage
 from gpu_memory_utils import (get_device_with_most_free_memory,
                               get_free_memory_dict,
                               get_gpu_ids_with_sufficient_memory)
 
-sys.path.append("../info-retrieval/CLIP_for_PPTs")
-from clip_for_ppts import ClipImage
+# from PIL import Image
 
-LECTURE_SLIDES_DIR = os.path.join(os.getcwd(), "lecture_slides")
 
+LECTURE_SLIDES_DIR = os.path.join(os.getcwd(), "lecture_slides")
 PINECONE_API_KEY = os.environ.get("PINECONE_API")