Hi,

In the last cell of C4W1 assignment, I got the same problem that my mse & mae are not the same as the expected output.

```
Failed test case: diff_moving_avg_plus_smooth_past has incorrect first 5 values.
Expected:
[59.77063 58.743534 57.702236 56.543404 55.74462 ],
but got:
[40.574306 44.581184 48.20017 51.96808 55.881516].
Failed test case: diff_moving_avg_plus_smooth_past has incorrect last 5 values.
Expected:
[29.718428 33.570488 37.043247 41.25437 45.228832],
but got:
[25.880426 26.018795 26.203758 25.86561 25.94249 ].
```

I calculated `smooth_past_series`

as `moving_average_forecast(SERIES[SPLIT_TIME-365-10:-365], 10)`

.

After looking at this question, it seems that I need to use `SERIES[SPLIT_TIME-365-5:-365+5]`

instead. I understand that window size is 10 hences the parts`-365-5`

then `-365+5`

, however, is it more correct to use `-365-10`

and `-365`

because the past series starts from `SPLIT_TIME-365`

and we need to subtract `10`

for the first window?

Thank you