code: def time_embed_dim(self):
      return self.time_input_dim * 4
  
imports: import unittest
  import numpy
  import torch
  from transformers import CLIPTextConfig, CLIPTextModel, CLIPTokenizer
  from diffusers import DDPMWuerstchenScheduler, WuerstchenPriorPipeline
  from diffusers.pipelines.wuerstchen import WuerstchenPrior
  from diffusers.utils.testing_utils import enable_full_determinism, skip_mps, torch_device
  from ..test_pipelines_common import PipelineTesterMixin
label_desc: Use image node_id 4 for calling the WuerstchenPriorPipelineFastTests obj's underlying member method code with example usage: obj.time_embed_dim() and returns: unknown