神经网络

import numpy as np
import utils


# Forward Neural Network (FNN)
class FNN:
    # layers = 3 and shape = [input dim, xx, class num]
    def __init__(self, shape, activation='sigmoid') -> None:
        self._l = len(shape) - 1  # layer number
        self._w = []  # weight
        self._b = []  # bias
        self._z = [i for i in range(self._l)]  # wx+b
        self._a = [i for i in range(self._l)]  # activation(wx+b)
        self._x = None  # input feature
        self._n = None  # batch size