(backend, arrays, expr)
return EVAL_CONSTS_BACKENDS[backend](arrays, expr)
Convert constant arrays to the correct backend, and perform as much of
    the contraction of ``expr`` with these as possible.
Convert constant arrays to the correct backend, and perform as much of
    the contraction of ``expr`` with these as possible.
Convert constant arrays to the correct backend and perform as much of the contraction of expr with these as possible .
def evaluate_constants(backend, arrays, expr):
    """Convert constant arrays to the correct backend, and perform as much of
    the contraction of ``expr`` with these as possible.
    """
    return EVAL_CONSTS_BACKENDS[backend](arrays, expr)
def evaluate_constants ( backend , arrays , expr ) : return EVAL_CONSTS_BACKENDS [ backend ] ( arrays , expr )