class_docstr: Stem
class_docstr_tok: ["Stem"]
code: def forward(self, x):
      x = self.conv(x)
      x = self.proj(x)
      _, _, h, w = x.shape
      x = x.flatten(2).transpose(1, 2)
      x = self.norm(x)
      return x, h, w
  
imports: import torch
  from torch import nn
  from timm.models.layers import DropPath
  import numpy
  from towhee.models.wave_vit.wave_vit_utils import DWT2D, IDWT2D
  from towhee.models.utils.init_vit_weights import init_vit_weights
  from towhee.models.layers.mlp import Mlp
label_desc: Use image node_id 2 for calling the Stem obj's underlying member method code with example usage: obj.forward(x) and returns: x,  h,  w