<jupyter_start><jupyter_text>원본 이미지를 수정 할 것 같을때는 x.copy()를 사용해야 한다.   element-wise<jupyter_code># element-wise relu
z=np.maximum(z,0.)

#element-wise add
z=x+y<jupyter_output><empty_output><jupyter_text>Broadcasting 작은 텐서에 맞춰서 연산하게 된다.<jupyter_code>x=np.array([1,2,3,4,5])
y=np.array([[1,1,1,1,1],[1,1,1,1,1]])
x.shape
y.shape
x+y<jupyter_output><empty_output><jupyter_text>tensor dot  tensor reshaping<jupyter_code>x=np.array([[0.,1.],[2.,3.],[4.,5.]])

x=x.reshape((6,1))


x
x=x.reshape((2,3))
x<jupyter_output><empty_output>
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