Larger Cohere Representation Models

Representation Models are now available in the sizes of medium-20220217 and large-20220217 as well as an updated version of small-20220217. Our previous small model will be available as small-20211115. In addition, the maximum tokens length per text has increased from 512 to 1024. We recommend keeping text lengths below 128 tokens for optimal performance; for any text longer than 128 tokens, the text is spliced and the resulting embeddings of each component are then averaged and returned.