code: def ensure_ndarray(ndarray_or_adjusted_array):
      
      if isinstance(ndarray_or_adjusted_array, ndarray):
          return ndarray_or_adjusted_array
      elif isinstance(ndarray_or_adjusted_array, AdjustedArray):
          return ndarray_or_adjusted_array.data
      else:
          raise TypeError(
              "Can't convert %s to ndarray" %
              type(ndarray_or_adjusted_array).__name__
          )
docs: Return the input as a numpy ndarray.
  
      This is a no-op if the input is already an ndarray.  If the input is an
      adjusted_array, this extracts a read-only view of its internal data buffer.
  
      Parameters
      ----------
      ndarray_or_adjusted_array : numpy.ndarray | zipline.data.adjusted_array
  
      Returns
      -------
      out : The input, converted to an ndarray.