python - Why my SGD is far off than my linear regression model? -


i'm trying compare linear regression (normal equation) sgd looks sgd far off. doing wrong?

here's code

x = np.random.randint(100, size=1000) y = x * 0.10 slope, intercept, r_value, p_value, std_err = stats.linregress(x=x, y=y) print("slope %f , intercept %s" % (slope,intercept)) #slope 0.100000 , intercept 1.61435309565e-11

and here's sgd

x = x.reshape(1000,1) clf = linear_model.sgdregressor() clf.fit(x, y, coef_init=0, intercept_init=0)  print(clf.intercept_) print(clf.coef_)  #[  1.46746270e+10] #[  3.14999003e+10]

i have thought coef , intercept same data linear.

when tried run code, got overflow error. suspect you're having same problem, reason, it's not throwing error.

if scale down features, works expected. using scipy.stats.linregress:

>>> x = np.random.random(1000) * 10 >>> y = x * 0.10 >>> slope, intercept, r_value, p_value, std_err = stats.linregress(x=x, y=y) >>> print("slope %f , intercept %s" % (slope,intercept)) slope 0.100000 , intercept -2.22044604925e-15

using linear_model.sgdregressor:

>>> clf.fit(x[:,none], y) sgdregressor(alpha=0.0001, epsilon=0.1, eta0=0.01, fit_intercept=true,        l1_ratio=0.15, learning_rate='invscaling', loss='squared_loss',        n_iter=5, penalty='l2', power_t=0.25, random_state=none,        shuffle=false, verbose=0, warm_start=false) >>> print("slope %f , intercept %s" % (clf.coef_, clf.intercept_[0])) slope 0.099763 , intercept 0.00163353754797

the value slope little lower, i'd guess that's because of regularization.


Comments

Post a Comment

Popular posts from this blog

javascript - Using jquery append to add option values into a select element not working -

i'm looking dynamically populate select element names of items stored array. for reason it's not working , i'm not sure why. html: <div class="col-md-4 col-md-offset-4"> <select class="select1"> </select> , <select class="select2"> </select> </div> note i'm using bootstrap layout. here's jquery i'm using try , populate ".select1" jquery: select: function() { $.each(state.greens, function(index, value) { $(".select1").append("<option value =' " + index + " '>" + state.greens[index].name + "</option>"); }); } note function 'select' stored within object called 'display'. state.greens name of array i'm trying access. so @ end of html page call display.select(); call function. no error messages showing in console. also, saw question: appending
Read more

Android soft keyboard reverts to default keyboard on orientation change -

i'm building android soft keyboard , can't seem fix bug - have arabic , qwerty keyboard , when rotate device on qwerty keyboard (or arabic shift), it's if program has "restarted" , becomes arabic keyboard without shift. the onsaveinstancestate(bundle savedinstancestate) not work because application not extend activity inputmethodservice . i put following in android manifest android:configchanges="keyboard|keyboardhidden|orientation" android:windowsoftinputmode="stateunchanged|adjustresize"> i tried using @override public void onconfigurationchanged(configuration newconfig) { super.onconfigurationchanged(newconfig); log.i(mydebug, "config changed " + currentkeyboard.equals(qwerty)); } however, currentkeyboard.equals(qwerty)) results false , made sure true before orientation change. any appreciated. i think applications fault. if application restarting on orientation change
Read more

Rendering JButton to get the JCheckBox behavior in a JTable by using images does not update my table -

i rendering jbutton image on simulate jcheckbox behavior. why don't let jtable render jcheckbox? because need bigger checkboxes , there's no way can resize them (as far know). so, have own table cell renderer , editor. both renders jbutton , checkbox images on them. trying change image checked image unchecked image (or vice versa) , update cell value (boolean true or false). however, reason, getcelleditorvalue() not update table. so, release mouse, value goes original one. any appreciated! lot! public class tableexample extends jframe { jscrollpane pane; jpanel panel; jtable table; object[][] data; mytablemodel tm; renderer buttoncolumn; public tableexample(object[][] data) throws ioexception { string[] columns = {"column#1", "column#2", "column#3", "column#4", "column#5", "column#6"}; this.data = data; this.setpreferredsize(new dimension(700, 500));
Read more