  Although there is an emerging trend towards generating embeddings for
primarily unstructured data and, recently, for structured data, no systematic
suite for measuring the quality of embeddings has been proposed yet. This
deficiency is further sensed with respect to embeddings generated for
structured data because there are no concrete evaluation metrics measuring the
quality of the encoded structure as well as semantic patterns in the embedding
space. In this paper, we introduce a framework containing three distinct tasks
concerned with the individual aspects of ontological concepts: (i) the
categorization aspect, (ii) the hierarchical aspect, and (iii) the relational
aspect. Then, in the scope of each task, a number of intrinsic metrics are
proposed for evaluating the quality of the embeddings. Furthermore, w.r.t. this
framework, multiple experimental studies were run to compare the quality of the
available embedding models. Employing this framework in future research can
reduce misjudgment and provide greater insight about quality comparisons of
embeddings for ontological concepts. We positioned our sampled data and code at
https://github.com/alshargi/Concept2vec under GNU General Public License v3.0.
