Improve computational time and memory usage of the calculation of a large Matrix that has four loops [Python]

I want to calculate a Matrix G that its elements is a scalar and are calculated as:

Improve computational time and memory usage of the calculation of a large Matrix that has four loops [Python]

I want to calculate a Matrix G that its elements is a scalar and are calculated as:

Improve computational time and memory usage of the calculation of a large Matrix that has four loops [Python]

I want to calculate a Matrix G that its elements is a scalar and are calculated as: