Large Two Dimensional Array

[Ayushi Dalmia]

Hello,

I am trying to implement IBM Model 1. In that I need to create a matrix of 50000*50000 with double values. Currently I am using dict of dict but it is unable to support such high dimensions and hence gives memory error. Any help in this regard will be useful. I understand that I cannot store the matrix in the RAM but what is the most efficient way to do this?