code: def forward(self, x):
      x = self.conv_layers(x)
      return rearrange(x, "b c f h w -> b (f h w) c")
  
imports: import torch
  from torch import nn, einsum
  import torch.nn.functional
  from einops import rearrange, repeat
label_desc: Use image node_id 3 for calling the Tokenizer obj's underlying member method code with example usage: obj.forward(x) and returns: rearrange