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7/25/2019 Lecture2 Neural Networks

1/12

:

:
7/25/2019 Lecture2 Neural Networks

2/12

Mc Culloch-Pitts943

y:

f:

1

1x

2x

mx

W1

W2

Wm

W0=-

Y

f

y

=

; (=

)

94-9 2
7/25/2019 Lecture2 Neural Networks

3/12

(

)

0Y0

0Y1f(Y)

Ye1

1f(Y)

2Y

2Y

YY

YY

Y

Y

e1

e1

ee

eetanh(Y)

)2

Ytanh(

e1

e1f(Y)

1

0

0

1

1

1-

94-9 3
7/25/2019 Lecture2 Neural Networks

4/12

m

:

m = 1

.

y = f (w0x0 -)

w0x0 - = 0 x0 = /w0

x

0

y=

1y=

0

94-9 4
7/25/2019 Lecture2 Neural Networks

5/12

m

:

m = 2

.

(11 + 22 )11 + 22 0

:

1 + 2 1 01 1; 2 1; 1

x

2

x

1

Y>

0

y=

1Y

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