ML notes on Bias, Variance and Decision Trees

Machine Learning Notes

Machine learning notes on Clustering

Clustering:

  ☐ The method of identifying similar groups(patterns) of data in a dataSet is called clustering.

  ☐ clustering can be divided into two subgroups :

      ☐ Hard Clustering

      ☐ Soft Clustering

    Types of clustering algorithms:

    Connectivity models:

    Centroid models:

      K-Means clustering algorithm

    Distribution models:

      example:- Normal, Gaussian

    Density Models:

    K-Means clustering algorithm:

 

   

Hierarchical Clustering:

Applications:-

·        Recommendation engines

·        Market segmentation

·        Social network analysis

·        Search result grouping

·        Medical imaging

·        Image segmentation

Intro to Machine learning:python setup

Tried many versions/flavours of python but this is finally working:

while setting up python for machine learning.

I followed the below steps :-

Install python-2.7.13.msi

• set PATH=C:\Python27

• set PATH=C:\Python27\Scripts

Go to http://www.lfd.uci.edu/~gohlke/pythonlibs/#scipy

Downloaded:- • numpy-1.13.1+mkl-cp27-cp27m-win32.whl 

                       • scipy-0.18.0-cp27-cp27m-win32.whl

Installing numpy: pip install numpy-1.13.1+mkl-cp27-cp27m-win32.whl

Installing scipy: pip install scipy-0.18.0-cp27-cp27m-win32.whl

You can test the correctness using below cmds:-

>>> import numpy
>>> import scipy
>>> import sklearn
>>> numpy.version.version
'1.13.1'
>>> scipy.version.version
'0.19.1'
>>>

Good things of doing this course:-

• Helped me in beliving that I can learn Machine Learning.
• Very interactive,you will not get bored
• Nice simple exercises,me being new to python running my code in python is very Joyful.
• Andrew's classes were very therotic and mathematical,one needs great concentration in understanding those concepts.

Dive in to Python world from Java

• Started learning python course in codeAcademy
• A smooth drive into python world for java developers http://python4java.necaiseweb.org/Main/TableOfContents

 Personal review:-

•  python is very easy to learn if you are coming from java background.
• Like Java, python is very vast,Target what you want to learn. For me I needed python knowledge as I am starting working on Machine Learning.
• It has lot of math tools n libraries required for Machine Learning