Log of day 19 completed

Log.md

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 **Thoughts** : Decision trees are very efficient algorithm , hoping to learn a lot .
 
 **Link of Work:** [Decision Tree 1](https://github.com/LordSomen/100DaysOfML/commit/7840457267f2ed38aac6b3fe7bfe276e03f887a6)
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+## Day 19 : Jul 19 , 2018
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+**Today's Progress** : Learned more about concepts of ML Decision trees.
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+**Thoughts** : Decision tree can be visualized easily that is why they are great , also they are sensitive to the data , chance of overfiting if hyperparameters are not used properly .
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+**Link of Work:** [Decision Tree 2](https://github.com/LordSomen/100DaysOfML/commit/76e9808329f6632d36146fd11e297fdaec403477)