Bibliography (4):

1. Unsupervised Cross-lingual Representation Learning at Scale

2. mT5: A massively multilingual pre-trained text-to-text transformer

3. DistilBERT, a distilled version of BERT: smaller, faster, cheaper and lighter

4. Wikipedia Bibliography:

   1. https://en.wikipedia.org/wiki/Amazon_Alexa  :

      https://en.wikipedia.org/wiki/Amazon_Alexa