Lin Ma questions

• pandas inner join performance issue
• calculate the differences between two rows in SQL
• decode string algorithm implementation for advice
• Python 2.7 store duplicate string or not
• regular expression match issue in Python
• confusion on 2 dimension kernel density estimation in R
• pandas import error using Pycharm
• object play not found in scala application
• thresholds in roc_curve in scikit learn
• Inner join two data sets using Apache Hadoop Pig

Lin Ma answers