This symbol is a type alias.
Source:
FloatOrReturningFloat = Union[
float,
numpy.float16,
numpy.float32,
numpy.float64,
tensorflow.python.framework.tensor.Tensor,
tensorflow.python.framework.sparse_tensor.SparseTensor,
tensorflow.python.ops.ragged.ragged_tensor.RaggedTensor,
tensorflow.python.framework.ops.EagerTensor,
numpy.ndarray,
int,
str,
bool,
Callable[[], tf_agents.types.Float
]
]