diff --git a/dalle2_pytorch/trainer.py b/dalle2_pytorch/trainer.py
index 84c0957..f9fc1d1 100644
--- a/dalle2_pytorch/trainer.py
+++ b/dalle2_pytorch/trainer.py
@@ -58,8 +58,15 @@ def num_to_groups(num, divisor):
         arr.append(remainder)
     return arr
 
-def get_pkg_version():
-    return __version__
+def clamp(value, min_value = None, max_value = None):
+    assert exists(min_value) or exists(max_value)
+    if exists(min_value):
+        value = max(value, min_value)
+
+    if exists(max_value):
+        value = min(value, max_value)
+
+    return value
 
 # decorators
 
@@ -227,10 +234,17 @@ class EMA(nn.Module):
         for ma_param, current_param in zip(list(self.ema_model.parameters()), list(self.online_model.parameters())):
             ma_param.data.copy_(current_param.data)
 
+        for ma_buffer, current_buffer in zip(list(self.ema_model.buffers()), list(self.online_model.buffers())):
+            ma_buffer.data.copy_(current_buffer.data)
+
     def get_current_decay(self):
-        epoch = max(0, self.step.item() - self.update_after_step - 1)
+        epoch = clamp(self.step.item() - self.update_after_step - 1, min_value = 0)
         value = 1 - (1 + epoch / self.inv_gamma) ** - self.power
-        return 0. if epoch < 0 else min(self.beta, max(self.min_value, value))
+
+        if epoch <= 0:
+            return 0.
+
+        return clamp(value, min_value = self.min_value, max_value = self.beta)
 
     def update(self):
         step = self.step.item()
@@ -521,7 +535,7 @@ class DecoderTrainer(nn.Module):
         loaded_obj = torch.load(str(path))
 
         if version.parse(__version__) != loaded_obj['version']:
-            print(f'loading saved decoder at version {loaded_obj["version"]}, but current package version is {get_pkg_version()}')
+            print(f'loading saved decoder at version {loaded_obj["version"]}, but current package version is {__version__}')
 
         self.decoder.load_state_dict(loaded_obj['model'], strict = strict)
         self.step.copy_(torch.ones_like(self.step) * loaded_obj['step'])
diff --git a/dalle2_pytorch/version.py b/dalle2_pytorch/version.py
index 70039a4..1b3c28f 100644
--- a/dalle2_pytorch/version.py
+++ b/dalle2_pytorch/version.py
@@ -1 +1 @@
-__version__ = '0.6.13'
+__version__ = '0.6.15'