diff --git a/docs/en/stack/ml/nlp/ml-nlp-elser.asciidoc b/docs/en/stack/ml/nlp/ml-nlp-elser.asciidoc index 7e79d37d2..5661b6f43 100644 --- a/docs/en/stack/ml/nlp/ml-nlp-elser.asciidoc +++ b/docs/en/stack/ml/nlp/ml-nlp-elser.asciidoc @@ -20,13 +20,28 @@ meaning and user intent, rather than exact keyword matches. ELSER is an out-of-domain model which means it does not require fine-tuning on your own data, making it adaptable for various use cases out of the box. + +[discrete] +[[elser-tokens]] +== Tokens - not synonyms + ELSER expands the indexed and searched passages into collections of terms that are learned to co-occur frequently within a diverse set of training data. The terms that the text is expanded into by the model _are not_ synonyms for the -search terms; they are learned associations. These expanded terms are weighted -as some of them are more significant than others. Then the {es} -{ref}/rank-features.html[rank features field type] is used to store the terms -and weights at index time, and to search against later. +search terms; they are learned associations capturing relevance. These expanded +terms are weighted as some of them are more significant than others. Then the +{es} {ref}/rank-features.html[rank features] field type is used to store the +terms and weights at index time, and to search against later. + +This approach provides a more understandable search experience compared to +vector embeddings. However, attempting to directly interpret the tokens and +weights can be misleading, as the expansion essentially results in a vector in a +very high-dimensional space. Consequently, certain tokens, especially those with +low weight, contain information that is intertwined with other low-weight tokens +in the representation. In this regard, they function similarly to a dense vector +representation, making it challenging to separate their individual +contributions. This complexity can potentially lead to misinterpretations if not +carefully considered during analysis. [discrete]