This is from the previous video.
When we multiply a*b ,its element wise multiplication…so sir found theta=np.linalg.pinv(firstpart)*secondpart…which should have performed element wise multiplication but surprisingly it gave the correct result?How?
It should have been np.dot( np.linalg.pinv(firstpart),secondpart)…Please let me know what is wrong in what I am thinking?
Hey @nikhil_sarda, you are completely right, it should be np.dot, but you forgot one thing, that '*" do element wise multiplication in case both operators are numpy.ndarray.
But here, we used
Y = np.mat(Y)
So by this we converted secondPart to <class ‘numpy.matrix’> and now * will perform dot product only.
If you decide not to use this line, you have to use np.dot().
Hope this cleared your doubt.
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