Python programming and a dataset

[buran]

It's not an error, just warning. It is explained here https://stackoverflow.com/a/47227886/4046632 if you didn't see it.
export TF_CPP_MIN_LOG_LEVEL=2 will set environmental variable TF_CPP_MIN_LOG_LEVEL to 2, i.e. don't show warnings. Or if you prefer - show only errors, fatal and num_severities levels. TensorFlow will check that variable when running to adjust the minimum logging level

here https://github.com/tensorflow/tensorflow.../logging.h is the definition of log levels:

Output:
INFO = 0;            // base_logging::INFO;
WARNING = 1;         // base_logging::WARNING;
ERROR = 2;           // base_logging::ERROR;
FATAL = 3;           // base_logging::FATAL;
NUM_SEVERITIES = 4;  // base_logging::NUM_SEVERITIES;