class_docstr: Autoformer encoder.
class_docstr_tok: ["Autoformer","encoder","."]
code: def _build(self):
      return self._Encoder(
          self.attn_layers, self.conv_layers, self.norm_layer
      )
  
imports: from sktime.utils.validation._dependencies import _check_soft_dependencies
  import math
label_desc: Use image node_id 2 for calling the Encoder obj's underlying member method code with example usage: obj._build() and returns: self