keras/src/backend/tensorflow/numpy.py/logspace
def logspace(start, stop, num=50, endpoint=True, base=10, dtype=None, axis=0):
    result = linspace(
        start=start,
        stop=stop,
        num=num,
        endpoint=endpoint,
        dtype=dtype,
        axis=axis,
    )
    return tf.pow(tf.cast(base, result.dtype), result)