class_docstr: An immutable partition with multiple dimension (str -> int).
  
  Partition is used together with _join as a key to join values.
  
  - If partition dimensions does not overlap at all, then joined result is a
  cartesian product.
  - If partition dimensions are exactly the same, then the joined result is a
  zip().
  - If partition dimensions partially overlaps, then the overlapping dimensions
  are zipped, and distinct dimensions are cartesian producted.
code: def partial(self, dimensions: Sequence[str]) -> Sequence[int]:
      return tuple(self[d] for d in dimensions)
  
file_path: tfx/tfx/orchestration/portable/input_resolution/partition_utils.py
imports: import collections
  from typing import Callable, Mapping, Sequence, Tuple, TypeVar
label_desc: Use image node_id 2 for calling the Partition obj's underlying member method code with example usage: obj.partial(dimensions) and returns: tuple