Check each padding start/end value
    and set the sufficient pad value.
    If we have asymmetry padding, we will return
    True to indicate the need for a separate padding function

def check_padding(pads, dim, padval):
    """Check each padding start/end value
    and set the sufficient pad value.
    If we have asymmetry padding, we will return
    True to indicate the need for a separate padding function"""
    asymmetry = False
    for i in range(dim):
        s = pads[i]
        e = pads[i+dim]
        if s == e:
            padval.append(s)
        else:
            asymmetry = True
            # We must add a separate pad function for asymmetry padding.
            # Since the pad function will do all the padding,
            # we will remove all padding here.
            del padval[:]
            padval.extend([0]*dim)
            break
    return asymmetry