def __init__(self,
data: numpy.ndarray = None,
dtype: type = DTYPE) -> None:
"""Constructor of a :class:`Tensor` object."""
if data is None:
self._data = None
elif isinstance(data, TensorValued):
self._data = data.contract()
elif isinstance(data, numpy.ndarray):
self._data = data
if dtype is None:
dtype = self._data.dtype
else:
self._data = numpy.array(data)
if dtype is None:
dtype = self._data.dtype
super().__init__(dtype)
