diff --git a/dalle2_pytorch/vqgan_vae_trainer.py b/dalle2_pytorch/vqgan_vae_trainer.py
index cbb6f1f..4047980 100644
--- a/dalle2_pytorch/vqgan_vae_trainer.py
+++ b/dalle2_pytorch/vqgan_vae_trainer.py
@@ -16,10 +16,11 @@ from torchvision.utils import make_grid, save_image
 
 from einops import rearrange
 
-from dalle2_pytorch.train import EMA
 from dalle2_pytorch.vqgan_vae import VQGanVAE
 from dalle2_pytorch.optimizer import get_optimizer
 
+from ema_pytorch import EMA
+
 # helpers
 
 def exists(val):
@@ -97,7 +98,7 @@ class VQGanVAETrainer(nn.Module):
         valid_frac = 0.05,
         random_split_seed = 42,
         ema_beta = 0.995,
-        ema_update_after_step = 2000,
+        ema_update_after_step = 500,
         ema_update_every = 10,
         apply_grad_penalty_every = 4,
         amp = False