diff --git a/examples/language/palm/train.py b/examples/language/palm/train.py
index 6725c07df..b17496954 100644
--- a/examples/language/palm/train.py
+++ b/examples/language/palm/train.py
@@ -1,22 +1,22 @@
 import gzip
 import random
-from time import time
 from functools import partial
+from time import time
+
 import numpy as np
 import torch
-import torch.optim as optim
 import torch.nn as nn
+import torch.optim as optim
 import tqdm
 from packaging import version
 from palm_pytorch import PaLM
 from palm_pytorch.autoregressive_wrapper import AutoregressiveWrapper
-from torch.nn import functional as F
 from torch.utils.data import DataLoader, Dataset
 
 import colossalai
 from colossalai.logging import disable_existing_loggers, get_dist_logger
 from colossalai.nn.optimizer.gemini_optimizer import GeminiAdamOptimizer
-from colossalai.nn.parallel import GeminiDDP, ZeroDDP
+from colossalai.nn.parallel import ZeroDDP
 from colossalai.tensor import ColoParameter, ComputePattern, ComputeSpec, ProcessGroup, ReplicaSpec, ShardSpec
 from colossalai.utils import MultiTimer, get_current_device
 from colossalai.utils.model.colo_init_context import ColoInitContext
@@ -69,6 +69,7 @@ def parse_args():
     args = parser.parse_args()
     return args
 
+
 # helpers
 def cycle(loader):
     while True:
@@ -79,12 +80,15 @@ def cycle(loader):
 def decode_token(token):
     return str(chr(max(32, token)))
 
+
 def get_tflops(model_numel, batch_size, seq_len, step_time):
     return model_numel * batch_size * seq_len * 8 / 1e12 / (step_time + 1e-12)
 
+
 def decode_tokens(tokens):
     return "".join(list(map(decode_token, tokens)))
 
+
 def get_model_size(model: nn.Module):
     total_numel = 0
     for module in model.modules():
@@ -92,6 +96,7 @@ def get_model_size(model: nn.Module):
             total_numel += p.numel()
     return total_numel
 
+
 # Gemini + ZeRO DDP
 def gemini_zero_dpp(model: torch.nn.Module, pg: ProcessGroup, placememt_policy: str = "auto"):
     cai_version = colossalai.__version__
@@ -115,6 +120,7 @@ def gemini_zero_dpp(model: torch.nn.Module, pg: ProcessGroup, placememt_policy:
         raise NotImplemented(f"CAI version {cai_version} is not supported")
     return model
 
+
 ## Parameter Sharding Strategies for Tensor Parallelism
 def split_param_single_dim_tp1d(dim: int, param: ColoParameter, pg: ProcessGroup):
     spec = (ShardSpec([dim], [pg.tp_world_size()]), ComputeSpec(ComputePattern.TP1D))
@@ -128,6 +134,7 @@ def split_param_row_tp1d(param: ColoParameter, pg: ProcessGroup):
 def split_param_col_tp1d(param: ColoParameter, pg: ProcessGroup):
     split_param_single_dim_tp1d(-1, param, pg)
 
+
 # Tensor Parallel
 def tensor_parallelize(model: torch.nn.Module, pg: ProcessGroup):
     """tensor_parallelize
@@ -159,7 +166,7 @@ def tensor_parallelize(model: torch.nn.Module, pg: ProcessGroup):
 
 args = parse_args()
 if args.distplan not in ["colossalai", "pytorch"]:
-        raise TypeError(f"{args.distplan} is error")
+    raise TypeError(f"{args.distplan} is error")
 disable_existing_loggers()
 colossalai.launch_from_torch(config={})
 logger = get_dist_logger()
@@ -216,7 +223,7 @@ else:
     model.cuda()
     optim = torch.optim.Adam(model.parameters(), lr=LEARNING_RATE)
 
- # model is shared after TP
+# model is shared after TP
 numel = get_model_size(model)
 get_tflops_func = partial(get_tflops, numel, args.batch_size, SEQ_LEN)
 
@@ -251,7 +258,7 @@ for i in tqdm.tqdm(range(NUM_BATCHES), mininterval=10.0, desc="training"):
         )
         if i >= WARMUP_BATCHES:
             tflops_list.append(step_tflops)
-    
+
     else:
         for __ in range(GRADIENT_ACCUMULATE_EVERY):
             loss = model(next(train_loader))
@@ -261,18 +268,17 @@ for i in tqdm.tqdm(range(NUM_BATCHES), mininterval=10.0, desc="training"):
         torch.nn.utils.clip_grad_norm_(model.parameters(), 0.5)
         optim.step()
         optim.zero_grad()
-    
+
 tflops_list.sort()
 median_index = ((NUM_BATCHES - WARMUP_BATCHES) >> 1) + WARMUP_BATCHES
 logger.info(f"Median TFLOPS is {tflops_list[median_index]:.3f}")
 
-
-    # TODO
-    # if i % VALIDATE_EVERY == 0:
-    #     model.eval()
-    #     with torch.no_grad():
-    #         loss = model(next(val_loader))
-    #         print(f"validation loss: {loss.item()}")
+# TODO
+# if i % VALIDATE_EVERY == 0:
+#     model.eval()
+#     with torch.no_grad():
+#         loss = model(next(val_loader))
+#         print(f"validation loss: {loss.item()}")
 
     # if i % GENERATE_EVERY == 0:
     #     model.eval()
@@ -282,4 +288,4 @@ logger.info(f"Median TFLOPS is {tflops_list[median_index]:.3f}")
 
     #     sample = model.generate(inp[None, ...], GENERATE_LENGTH)
     #     output_str = decode_tokens(sample[0])
-    #     print(output_str)
\ No newline at end of file
+    #     print(output_str)