Least Square Aggregation

[pratham16cse]

• [x] Create first level of aggregation
• [x] Model and overall code should support multiple values in the time-series
• [x] Create new inference model for least square based aggregation
• [x] Write optimizer for least square consistency during inference
• [x] Modify real dataset processing such that each sequence is 3 dimensional at level 1
• [x] Multiple aggregation support in the main.py file (sum, leastsquare)