diff --git a/bmtrain/optim/adam.py b/bmtrain/optim/adam.py
index fdec501b..12bbf9e6 100644
--- a/bmtrain/optim/adam.py
+++ b/bmtrain/optim/adam.py
@@ -3,6 +3,7 @@
 import torch.optim._functional as F
 from . import _cuda as C
 from .. import nccl
+import inspect
 
 class AdamOptimizer(torch.optim.Optimizer):
     """
@@ -117,6 +118,9 @@ def step(self, closure=None):
                             state['step']
                         )
                     else:
+                        other_kwargs = {}
+                        if 'maximize' in inspect.signature(F.adam).parameters:
+                            other_kwargs['maximize'] = False
                         F.adam(
                             [p],
                             [p.grad / self._scale],
@@ -130,7 +134,7 @@ def step(self, closure=None):
                             lr=0.0 if state["step"] <= self._hold_steps else group['lr'],
                             weight_decay=group['weight_decay'],
                             eps=group['eps'],
-                            maximize=False
+                            **other_kwargs
                         )
 
         return loss
diff --git a/bmtrain/optim/adam_offload.py b/bmtrain/optim/adam_offload.py
index 207f0abe..45fa726f 100644
--- a/bmtrain/optim/adam_offload.py
+++ b/bmtrain/optim/adam_offload.py
@@ -4,6 +4,7 @@
 from . import _cuda as G
 from .. import nccl
 import torch.optim._functional as F
+import inspect
 
 class AdamOffloadOptimizer(torch.optim.Optimizer):
     """
@@ -27,6 +28,7 @@ def __init__(self, params, lr=1e-3, betas=(0.9, 0.999), eps=1e-8, weight_decay=0
         self._scale = scale
         self._steps_since_last_scale = 0
         self._hold_steps = hold_steps
+        self._events = {}
 
     @property
     def scale(self):
@@ -102,21 +104,22 @@ def step(self, closure=None):
                             # placeholder
                             state["_grad_fp32"] = torch.empty(p.size(), dtype=torch.float32, pin_memory=True)   # on host
 
-                        state["_load_event"] = torch.cuda.Event()
+                    if p not in self._events:
+                        self._events[p] = torch.cuda.Event()
 
-                    update_params.append((p, state, group['betas'][0], group['betas'][1], group['eps'], group['lr'], group['weight_decay']))
+                    update_params.append((p, state, self._events[p], group['betas'][0], group['betas'][1], group['eps'], group['lr'], group['weight_decay']))
 
         # transfer parameters to host asynchronously
-        for param, state, _, _, _, _, _ in update_params:
+        for param, state, event, _, _, _, _, _ in update_params:
             if param.dtype == torch.half:
                 state["_grad_fp16"].copy_(param.grad, non_blocking=True)
             else:
                 state["_grad_fp32"].copy_(param.grad, non_blocking=True)
-            torch.cuda.current_stream().record_event(state["_load_event"])
+            torch.cuda.current_stream().record_event(event)
 
-        for param, state, beta1, beta2, eps, lr, weight_decay in update_params:
+        for param, state, event, beta1, beta2, eps, lr, weight_decay in update_params:
             # wait for transfer to host
-            state["_load_event"].synchronize()
+            event.synchronize()
 
             state["step"] += 1
 
@@ -138,6 +141,10 @@ def step(self, closure=None):
                 param.copy_(state["_param_fp16"], non_blocking=True)
             else:
                 state["_grad_fp32"].mul_(1.0 / self._scale)
+                
+                other_kwargs = {}
+                if 'maximize' in inspect.signature(F.adam).parameters:
+                    other_kwargs['maximize'] = False
                 F.adam(
                     [state["_param_fp32"]],
                     [state["_grad_fp32"]],
@@ -151,7 +158,7 @@ def step(self, closure=None):
                     lr=0.0 if state["step"] <= self._hold_steps else lr,
                     weight_decay=weight_decay,
                     eps=eps,
-                    maximize=False
+                    **other_kwargs
                 )
                 # transfer parameters back to device asynchronously
                 param.copy_(state["_param_fp32"], non_blocking=True)