diff --git a/engines/python/setup/djl_python/rolling_batch/lmi_dist_rolling_batch.py b/engines/python/setup/djl_python/rolling_batch/lmi_dist_rolling_batch.py
index 3858d1834e..7e9b979ca0 100644
--- a/engines/python/setup/djl_python/rolling_batch/lmi_dist_rolling_batch.py
+++ b/engines/python/setup/djl_python/rolling_batch/lmi_dist_rolling_batch.py
@@ -21,13 +21,10 @@
     StoppingCriteriaParameters,
 )
 import lmi_dist
-from lmi_dist.utils.types import (
-    Batch,
-    Request,
-    Generation
-)
+from lmi_dist.utils.types import (Batch, Request, Generation)
 import logging
 import torch
+import os
 
 ARCHITECTURE_2_BATCH_CLS = {
     "RWForCausalLM": FlashCausalLMBatch,
@@ -36,6 +33,8 @@
     "LlamaForCausalLM": FlashCausalLMBatch
 }
 
+QUANTIZATION_SUPPORT_ALGO = ["bitsanadbytes"]
+
 
 def get_batch_cls_from_architecture(architecture):
     if architecture in ARCHITECTURE_2_BATCH_CLS:
@@ -54,7 +53,7 @@ def __init__(self, model_id_or_path, device, properties, **kwargs):
         :param properties: other properties of the model, such as decoder strategy
         :param kwargs passed while loading the model
         """
-
+        os.environ["BITSANDBYTES_NOWELCOME"] = "1"
         super().__init__(device)
         self.properties = properties
         self.batch_cls = None
@@ -63,20 +62,25 @@ def __init__(self, model_id_or_path, device, properties, **kwargs):
         self.cache: Batch = None
 
     def _init_model(self, kwargs, model_id_or_path):
-        self.config = AutoConfig.from_pretrained(model_id_or_path,
-                                                 **kwargs)
-        self.batch_cls = get_batch_cls_from_architecture(self.config.architectures[0])
+        self.config = AutoConfig.from_pretrained(model_id_or_path, **kwargs)
+        self.batch_cls = get_batch_cls_from_architecture(
+            self.config.architectures[0])
         sharded = int(self.properties.get("tensor_parallel_degree", "-1")) > 1
         quantize = self.properties.get("quantize", None)
-        if quantize and quantize != "bitsanadbytes":
-            logging.info(f"Invalid value for quantize: {quantize}. Only `bitsandbytes` quantization is supported. "
-                         f"Setting quantization to None")
+        dtype = self.properties.get("dtype", None)
+        if quantize is not None and dtype is not None:
+            logging.error("Can't set both dtype and quantize")
+        if quantize and quantize not in QUANTIZATION_SUPPORT_ALGO:
+            logging.error(
+                f"Invalid value for quantize: {quantize}. Only `bitsandbytes` quantization is supported."
+            )
             quantize = None
-        self.model = get_model(model_id_or_path,
-                               revision=None,
-                               sharded=sharded,
-                               quantize=quantize,
-                               trust_remote_code=kwargs.get("trust_remote_code"))
+        self.model = get_model(
+            model_id_or_path,
+            revision=None,
+            sharded=sharded,
+            quantize=quantize,
+            trust_remote_code=kwargs.get("trust_remote_code"))
 
     def inference(self, input_data, parameters):
         """
@@ -96,15 +100,18 @@ def inference(self, input_data, parameters):
     def _prefill_and_decode(self, new_batch):
         # prefill step
         if new_batch:
-            generations, prefill_next_batch = self.model.generate_token(new_batch)
+            generations, prefill_next_batch = self.model.generate_token(
+                new_batch)
 
             if self.cache:
-                decode_generations, decode_next_batch = self.model.generate_token(self.cache)
+                decode_generations, decode_next_batch = self.model.generate_token(
+                    self.cache)
                 generations.extend(decode_generations)
 
                 # concatenate with the existing batch of the model
                 if decode_next_batch:
-                    self.cache = self.model.batch_type.concatenate([prefill_next_batch, decode_next_batch])
+                    self.cache = self.model.batch_type.concatenate(
+                        [prefill_next_batch, decode_next_batch])
                 else:
                     self.cache = prefill_next_batch
             else:
@@ -113,7 +120,10 @@ def _prefill_and_decode(self, new_batch):
             generations, next_batch = self.model.generate_token(self.cache)
             self.cache = next_batch
 
-        generation_dict = {generation.request_id: generation for generation in generations}
+        generation_dict = {
+            generation.request_id: generation
+            for generation in generations
+        }
 
         req_ids = []
         for r in self.pending_requests:
@@ -132,22 +142,25 @@ def preprocess_requests(self, requests, **kwargs):
         for r in requests:
             param = r.parameters
             parameters = NextTokenChooserParameters(
-                temperature=param.get("temperature", 0.5), # TODO: Find a better place to put default values
+                temperature=param.get(
+                    "temperature",
+                    0.5),  # TODO: Find a better place to put default values
                 repetition_penalty=param.get("repetition_penalty", 1.0),
                 top_k=param.get("top_k", 4),
                 top_p=param.get("top_p", 1.0),
                 typical_p=param.get("typical_p", 1.0),
                 do_sample=param.get("do_sample", False),
             )
-            stop_parameters = StoppingCriteriaParameters(stop_sequences=param.get("stop_sequences", []),
-                                                         max_new_tokens=param.get("max_new_tokens", 30))
+            stop_parameters = StoppingCriteriaParameters(
+                stop_sequences=param.get("stop_sequences", []),
+                max_new_tokens=param.get("max_new_tokens", 30))
 
-            preprocessed_requests.append(lmi_dist.utils.types.Request(
-                id=r.id,
-                inputs=r.input_text,
-                parameters=parameters,
-                stopping_parameters=stop_parameters
-            ))
+            preprocessed_requests.append(
+                lmi_dist.utils.types.Request(
+                    id=r.id,
+                    inputs=r.input_text,
+                    parameters=parameters,
+                    stopping_parameters=stop_parameters))
 
         if preprocessed_requests:
             batch = Batch(id=self.batch_id_counter,
@@ -156,10 +169,7 @@ def preprocess_requests(self, requests, **kwargs):
             self.batch_id_counter += 1
 
             return self.batch_cls.get_batch(
-                batch,
-                self.model.tokenizer,
-                kwargs.get("torch_dtype", torch.float16),
-                self.device
-            )
+                batch, self.model.tokenizer,
+                kwargs.get("torch_dtype", torch.float16), self.device)
         else:
             return None