diff --git a/codes/models/audio/music/transformer_diffusion13.py b/codes/models/audio/music/transformer_diffusion13.py
index 66db3b21..89f09d6c 100644
--- a/codes/models/audio/music/transformer_diffusion13.py
+++ b/codes/models/audio/music/transformer_diffusion13.py
@@ -1,40 +1,25 @@
 import itertools
 from random import randrange
-from time import time
 
 import torch
 import torch.nn as nn
 import torch.nn.functional as F
 
 from models.arch_util import ResBlock, TimestepEmbedSequential, AttentionBlock
-from models.audio.music.gpt_music2 import UpperEncoder, GptMusicLower
-from models.audio.music.music_quantizer2 import MusicQuantizer2
-from models.audio.tts.lucidrains_dvae import DiscreteVAE
 from models.diffusion.nn import timestep_embedding, normalization, zero_module, conv_nd, linear
 from models.diffusion.unet_diffusion import TimestepBlock
-from models.lucidrains.x_transformers import Encoder, Attention, RMSScaleShiftNorm, \
-    FeedForward
 from trainer.networks import register_model
-from utils.util import checkpoint, print_network
+from utils.util import checkpoint
 
 
 def is_latent(t):
     return t.dtype == torch.float
 
+
 def is_sequence(t):
     return t.dtype == torch.long
 
 
-class MultiGroupEmbedding(nn.Module):
-    def __init__(self, tokens, groups, dim):
-        super().__init__()
-        self.m = nn.ModuleList([nn.Embedding(tokens, dim // groups) for _ in range(groups)])
-
-    def forward(self, x):
-        h = [embedding(x[:, :, i]) for i, embedding in enumerate(self.m)]
-        return torch.cat(h, dim=-1)
-
-
 class SubBlock(nn.Module):
     def __init__(self, inp_dim, contraction_dim, blk_dim, heads, dropout):
         super().__init__()