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add a note about regularization strength

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Original file line number	Diff line number	Diff line change
`@@ -2028,6 +2028,9 @@`
`2028`	`2028`	`"from sklearn.linear_model import LogisticRegression\n",`
`2029`	`2029`	`"\n",`
`2030`	`2030`	`"lr = LogisticRegression(penalty='l1', C=1.0)\n",`
	`2031`	`+ "# Note that C=1.0 is the default. You can increase\n",`
	`2032`	`+ "# or decrease it to make the regulariztion effect\n",`
	`2033`	`+ "# stronger or weaker, respectively.\n",`
`2031`	`2034`	`"lr.fit(X_train_std, y_train)\n",`
`2032`	`2035`	`"print('Training accuracy:', lr.score(X_train_std, y_train))\n",`
`2033`	`2036`	`"print('Test accuracy:', lr.score(X_test_std, y_test))"`

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