Score meanings
The scores are in the 0-1 range with increments of 0.25 with the following meanings:

1.0 - Very close match. This is typically an exact match except possibly for differences in conjugation, quantity (e.g. singular vs. plural), and addition or removal of stopwords (e.g. “the”, “and”, “or”).
0.75 - Close synonym, e.g. “mobile phone” vs. “cellphone”. This also includes abbreviations, e.g. "TCP" -> "transmission control protocol".
0.5 - Synonyms which don’t have the same meaning (same function, same properties). This includes broad-narrow (hyponym) and narrow-broad (hypernym) matches.
0.25 - Somewhat related, e.g. the two phrases are in the same high level domain but are not synonyms. This also includes antonyms.
0.0 - Unrelated.
Files
train.csv - the training set, containing phrases, contexts, and their similarity scores
test.csv - the test set set, identical in structure to the training set but without the score
sample_submission.csv - a sample submission file in the correct format
Columns
id - a unique identifier for a pair of phrases
anchor - the first phrase
target - the second phrase
context - the CPC classification (version 2021.05), which indicates the subject within which the similarity is to be scored
score - the similarity. This is sourced from a combination of one or more manual expert ratings.