( I n p u t ) x = n p . a r r a y ( [ 1 . 0 , 0 . 5 , 0 . 3 ] ) b 1 = n p . a r r a y ( [ 0 . 1 , 0 . 2 , 0 . 3 ] ) # L a y e r 2 W 1 = n p . a r r a y ( [ [ 0 . 1 , 0 . 3 , 0 . 5 ] , [ 0 . 2 , 0 . 4 , 0 . 6 ] , [ . . . ] ] ) a 1 = n p . d o t ( x , W 1 ) + b 1 z 1 = s i g m o i d ( a 1 ) b 2 = n p . a r r a y ( [ 0 . 1 , 0 . 2 ] ) # L a y e r 3 W 2 = n p . a r r a y ( [ [ 0 . 1 , 0 . 4 ] , [ 0 . 2 , 0 . 5 ] , [ 0 . 3 , 0 . 6 ] ] ) a 2 = n p . d o t ( z 1 , W 2 ) + b 2 z 2 = s i g m o i d ( a 2 ) b 3 = n p . a r r a y ( [ 0 . 1 , 0 . 2 ] ) # L a y e r 4 ( O u t p u t ) W 3 = n p . a r r a y ( [ [ 0 . 1 , 0 . 3 ] , [ 0 . 2 , 0 . 4 ] ] ) a 3 = n p . d o t ( z 2 , W 3 ) + b 3 y = i d e n t i t y _ f u n c t i o n ( a 3 )