code: def build(self, framework):
      assert framework == "torch", "Unsupported framework `{}`!".format(
          framework
      )
      return MobileNetV2Encoder(self)
  
file_path: ray/python/ray/rllib/examples/models/mobilenet_v2_encoder.py
imports: from ray.rllib.core.models.base import Encoder, ENCODER_OUT
  from ray.rllib.core.models.configs import ModelConfig
  from ray.rllib.core.models.torch.base import TorchModel
  from ray.rllib.utils.framework import try_import_torch
label_desc: Use image node_id 1 for calling the MobileNetV2EncoderConfig obj's underlying member method code with example usage: obj.build(framework) and returns: MobileNetV2Encoder