class_docstr: A `SchemaRepr` represents the data queue schema.
  
  Args:
      name (`str`): The name column data.
      type (`ColumnType`): The type of the column data, such as ColumnType.SCALAR or ColumnType.QUEUE.
docstr: Return a SchemaRepr from the dag info.
  
  Args:
      col_name (`str`): Schema name.
      iter_type (`Dict[str, Any]`): The iteration type of this node.
      inputs_type (`List`): A list of the inputs schema type.
  
  Returns:
      SchemaRepr object.
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code: def from_dag(col_name: str, iter_type: str, inputs_type: List = None):
      """Return a SchemaRepr from the dag info.
  
      Args:
          col_name (`str`): Schema name.
          iter_type (`Dict[str, Any]`): The iteration type of this node.
          inputs_type (`List`): A list of the inputs schema type.
  
      Returns:
          SchemaRepr object.
      """
      if iter_type in [
          FlatMapConst.name,
          WindowConst.name,
          TimeWindowConst.name,
      ]:
          col_type = ColumnType.QUEUE
      elif iter_type == ConcatConst.name:
          col_type = inputs_type[0]
      elif iter_type in [WindowAllConst.name, ReduceConst.name]:
          col_type = ColumnType.SCALAR
      elif iter_type in [MapConst.name, FilterConst.name]:
          if (
              inputs_type is not None
              and ColumnType.QUEUE in inputs_type
          ):
              col_type = ColumnType.QUEUE
          else:
              col_type = ColumnType.SCALAR
      else:
          raise ValueError(f"Unknown iteration type: {iter_type}")
      return SchemaRepr(name=col_name, type=col_type)
  
imports: from typing import List
  from pydantic import BaseModel
  from towhee.runtime.data_queue import ColumnType
  from towhee.runtime.constants import WindowAllConst, WindowConst, ReduceConst, FilterConst, TimeWindowConst, FlatMapConst, ConcatConst, MapConst
label_desc: Use image node_id 1 for calling the SchemaRepr obj's underlying member method code with example usage: obj.from_dag(col_name, iter_type, inputs_type) and returns: SchemaRepr