The file data.pkl uses a subset of data from https://nlp.stanford.edu/projects/histwords/
The file is a dictionary that contains the following entries:
'w': a list of 2000 words, a subset of the English lexicon
'd': a list of decades between 1900 and 2000
'E': a 2000 by 10 by 300 list of list of vectors; the (i,j)-th entry is a 300-dimensional vector for the i-th word in the j-th decade

Reference:
Hamilton, W. L., Leskovec, J., & Jurafsky, D. (2016). Diachronic word embeddings reveal statistical laws of semantic change. In Proceedings of the 54th annual meeting of the association for computational linguistics (volume 1:Long papers)(pp. 1489–1501).