The phrase "an existing topic" is correct and usable in written English.
You can use it when referring to a subject or theme that is already established or recognized in a particular context.
Example: "In our discussion, we will focus on an existing topic that has garnered significant attention in recent research."
Alternatives: "a current topic" or "a recognized topic".
This tutorial shows how to perform inference on a new dataset using an existing topic model.
If you'd prefer to discuss an existing topic, Overtime provides a library of thousands of GIFs and photos over which you can embed comments.
A wholly original topic can provide all the novelty you need, but you could also cover an existing topic in a new way, such as with a new perspective or a new tone of voice.
Sometimes reading a new spin on an existing topic is all it will take to spark an idea.
In the meeting discussion, students are asked: Whether there is an existing topic in wikiHow.
We combined this relatedness indicator between topics in biotech with the scientific portfolio of cities (i.e. the topics on which they published previously) to determine how cognitively close a potentially new topic (or an existing topic) is to the scientific portfolio of a city.
We use the WordNet2 lexical database as a basis to obtain the synonyms of the lemmas for each existing topic and group those topics who share the synonyms.
However, neither categorical nor Gaussian observational distributions used in existing topic models are appropriate to leverage such correlations.
It is empirically found that HDLA model with three layers of hidden units is good enough to generate latent topic-based image representation having more discriminative power and retrieval accuracy than the existing topic modeling schemes.
The app is probably best known for the ability to "DJ your news," creating customized news streams, either from scratch or by modifying one of Taptu's existing topic streams.
A theoretical framework used in the field of education known as schema theory 41 highlights that the way people engage with new material is influenced by their "schema" (existing topic knowledge and expectations).
