如上图所示的两层神经网络,

单样本向量化:                                                                                 多样本向量化:

for i=1 to 4:

  z[1](i)  =  W[1](i)  x(i)   +  b[1](i)                                       Z[1]  =  W[1]  X+  b[1]

(4,1)               (4,3)        (3,1)             (4,1)                              (4,4)          (4,3)       (3,4)         (4,4)

  a[1](i)  =sigmoid( z[1](i)  )                                                   A[1]  =  sigmoid( Z[1]   )

  (4,1)                         (4,1)                                                       (4,4)                              (4,4)

    z[2](i)  =  W[2](i) a[1](i)   +       b[2](i)                                        Z[2]  =  W[2]  A[1]  +  b[2]

(1,1)               (1,4)        (4,1)             (1,1)                             (1,4)                (1,4)     (4,4)              [1,4]

  a[2](i)  =sigmoid( z[2](i)  )                                                        A[2]  =  sigmoid( Z[2] )

(1,1)                          (1,1)                                                      (1,4)                               (1,4)

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