class_docstr: Image to Patch Embedding
      
class_docstr_tok: ["Image","to","Patch","Embedding"]
code: def forward(self, x):
      B, C, H, W = x.shape
      assert (
          H == self.img_size[0] and W == self.img_size[1]
      ), "Input image size ({H}*{W}) doesn't match model ({self.img_size[0]}*{self.img_size[1]})."
  
      x = self.proj(x).flatten(2).transpose((0, 2, 1))
      return x
  
imports: import numpy
  import paddle
  import paddle.nn
  import paddle.nn.functional
  from paddle.nn import Layer
  from paddle.nn import Linear
  from paddle.nn.initializer import Constant
  from paddle.nn.initializer import Normal
  from paddle.nn.initializer import TruncatedNormal
label_desc: Use image node_id 2 for calling the PatchEmbed obj's underlying member method code with example usage: obj.forward(x) and returns: x