Backend/optimizers/__init__.py

from .adam import AdamOptimizer
from .SGD import SGDOptimizer
from .azure_optim import Azure
from .RMSprop import RMSpropOptimizer
from .base import BaseOptimizer

__all__ = [
    'AdamOptimizer',
    'SGDOptimizer',
    'Azure',
    'RMSpropOptimizer',
    'BaseOptimizer'
]