I am using the following to suppress my warnings. Sometimes the warning are suppressed, while more recently they are of no use and the warnings still appear.
> import warnings
> warnings.filterwarnings("ignore")
I am using Jupyter-notebook and working with Tensorflow (also with Keras, but not for this particular question, but the same thing happens with Keras as well)
If it stopped working maybe you forgot to execute first the cell with the ignoring code?
Please note the additional line as per the answer to Disable warnings in jupyter notebook.