class_docstr: Encodes numpy ndarray into, or decodes an ndarray from, a spark dataframe field.
docstr: Represent this as the following form:
  
  >>> NdarrayCodec()
docstr_tok: ["Represent","this","as","the","following","form",":",">",">",">","NdarrayCodec","(",")"]
code: def __str__(self):
      """Represent this as the following form:
  
      >>> NdarrayCodec()
      """
      return f"{type(self).__name__}()"
  
imports: from abc import abstractmethod
  from io import BytesIO
  import numpy
label_desc: Use image node_id 4 for calling the NdarrayCodec obj's underlying member method code with example usage: obj.__str__() and returns: type, str