abstract = "This work deals with the problem of text mining which
is becoming more popular due to exponential growth of
the data in electronic form. The work explores
contemporary methods and their improvement using
optimization methods, as well as the problem of text
data understanding in general. The work addresses the
problem in three ways: using traditional methods and
their optimizations, using Big Data in train phase and
abstraction through the minimization of
language-dependent parts, and introduction of the new
method based on the deep learning which is closer to
how human reads and understands text data. The main aim
of the dissertation was to propose a method for machine
understanding of unstructured text data. The method was
experimentally verified by classification of text data
on 5 different languages: Czech, English, German,
Spanish and Chinese. This demonstrates possible
application to different languages families. Validation
on the Yelp evaluation database achieve accuracy higher
by 0.5% than current methods.",