code: def num_patches(self) -> int:
      return self.to_patches.num_patches
  
imports: import torch
  import torch.nn
  from torch import Tensor
  from typing import Any
  from typing import Dict
  from typing import Type
  from typing import Optional
  from cftool.misc import safe_execute
  from cftool.misc import check_requires
  from cftool.misc import WithRegister
  from cftool.types import tensor_dict_type
  from ....schema import _forward
  from ....schema import TrainerState
  from ....constants import INPUT_KEY
  from ....constants import LATENT_KEY
  from ....misc.toolkit import eval_context
  from ....misc.toolkit import get_device
  from ....modules.blocks import ImgToPatches
label_desc: Use image node_id 2 for calling the EncoderFromPatchesMixin obj's underlying member method code with example usage: obj.num_patches() and returns: self