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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def from_proto(cls, repeated_split_infos):
 """Returns a new SplitDict initialized from the `repeated_split_infos`."""

    split_dict = cls()
    for split_info_proto in repeated_split_infos:
      split_info = SplitInfo()
      split_info.CopyFrom(split_info_proto)
      split_dict.add(split_info)
    return split_dict