class_docstr: MultiProblem base class.
class_docstr_tok: ["MultiProblem","base","class","."]
code: def filepattern(self, data_dir, mode, shard=None):
      tf.logging.info("Generating multi problem filepattern")
      return [
          task.filepattern(data_dir, mode, shard)
          for task in self.task_list
      ]
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  from tensor2tensor.data_generators import problem
  from tensor2tensor.data_generators import text_problems
  from tensor2tensor.layers import common_layers
  from tensor2tensor.layers import discretization
  from tensor2tensor.layers import modalities
  from tensor2tensor.utils import metrics
  import tensorflow.compat.v1
  from tensorflow.compat.v1 import estimator
label_desc: Use image node_id 4 for calling the MultiProblem obj's underlying member method code with example usage: obj.filepattern(data_dir, mode, shard) and returns: unknown