diff --git a/demo.py b/demo.py
index 4a23e80..64f099a 100644
--- a/demo.py
+++ b/demo.py
@@ -113,8 +113,8 @@ with gr.Blocks() as demo:
             
             num_beams = gr.Slider(
                 minimum=1,
-                maximum=16,
-                value=5,
+                maximum=10,
+                value=1,
                 step=1,
                 interactive=True,
                 label="beam search numbers)",
diff --git a/environment.yml b/environment.yml
index 552fe3a..d5cfcf8 100644
--- a/environment.yml
+++ b/environment.yml
@@ -25,7 +25,7 @@ dependencies:
     - filelock==3.9.0
     - fonttools==4.38.0
     - frozenlist==1.3.3
-    - huggingface-hub==0.12.1
+    - huggingface-hub==0.13.4
     - importlib-resources==5.12.0
     - kiwisolver==1.4.4
     - matplotlib==3.7.0
diff --git a/minigpt4/conversation/conversation.py b/minigpt4/conversation/conversation.py
index b0c2711..84aea9a 100644
--- a/minigpt4/conversation/conversation.py
+++ b/minigpt4/conversation/conversation.py
@@ -134,8 +134,8 @@ class Chat:
         else:
             conv.append_message(conv.roles[0], text)
 
-    def answer(self, conv, img_list, max_new_tokens=200, num_beams=5, min_length=1, top_p=0.9,
-               repetition_penalty=1.0, length_penalty=1, temperature=1):
+    def answer(self, conv, img_list, max_new_tokens=200, num_beams=1, min_length=1, top_p=0.9,
+               repetition_penalty=1.0, length_penalty=1, temperature=1.0):
         conv.append_message(conv.roles[1], None)
         embs = self.get_context_emb(conv, img_list)
         outputs = self.model.llama_model.generate(
@@ -143,6 +143,7 @@ class Chat:
             max_new_tokens=max_new_tokens,
             stopping_criteria=self.stopping_criteria,
             num_beams=num_beams,
+            do_sample=True,
             min_length=min_length,
             top_p=top_p,
             repetition_penalty=repetition_penalty,
diff --git a/minigpt4/models/mini_gpt4.py b/minigpt4/models/mini_gpt4.py
index 49dd467..5c223fe 100644
--- a/minigpt4/models/mini_gpt4.py
+++ b/minigpt4/models/mini_gpt4.py
@@ -84,7 +84,8 @@ class MiniGPT4(Blip2Base):
         self.llama_tokenizer.pad_token = self.llama_tokenizer.eos_token
 
         self.llama_model = LlamaForCausalLM.from_pretrained(
-            llama_model, torch_dtype=torch.float16
+            llama_model, torch_dtype=torch.float16,
+            load_in_8bit=True, device_map="auto"
         )
         for name, param in self.llama_model.named_parameters():
             param.requires_grad = False
@@ -107,12 +108,17 @@ class MiniGPT4(Blip2Base):
             self.prompt_list = []
 
     def encode_img(self, image):
-        with self.maybe_autocast():
-            image_embeds = self.ln_vision(self.visual_encoder(image))
-            image_atts = torch.ones(image_embeds.size()[:-1], dtype=torch.long).to(
-                image.device
-            )
+        device = image.device
+        self.ln_vision.to("cpu")
+        self.ln_vision.float()
+        self.visual_encoder.to("cpu")
+        self.visual_encoder.float()
+        image = image.to("cpu")
 
+        image_embeds = self.ln_vision(self.visual_encoder(image)).to(device)
+        image_atts = torch.ones(image_embeds.size()[:-1], dtype=torch.long).to(device)
+
+        with self.maybe_autocast():
             query_tokens = self.query_tokens.expand(image_embeds.shape[0], -1, -1)
             query_output = self.Qformer.bert(
                 query_embeds=query_tokens,