Kalman filter

Just finding some resources for learning about Kalman filter, seems it is a very useful technique which applicable on a lot of different areas.

References:

https://blog.maddevs.io/reduce-gps-data-error-on-android-with-kalman-filter-and-accelerometer-43594faed19c

Conflict between pandas 0.25.0 and pandas-datareader 0.7.0

For Python users, there is a conflict between "pandas 0.25.0" and "pandas-datareader 0.7.0".

If you do an "from pandas_datareader import data", you will got a conflict:

    "ImportError: cannot import name StringIO from pandas.compat"

To get rid of this issue, use "pandas 0.24.2" + "pandas-datareader 0.7.0" instead.