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Prepare batches of data for training machine learning solar electricity nowcasting data

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## Detailed Description At the moment, for each ML example, we ask our ML models to directly predict total solar PV power generation for an entire _region_ of the country...

enhancement
good first issue
data

## Detailed Description Try automatically running MyPy on this code, to do static analysis We might want to turn off a bunch of the less interesting warnings / errors :)

enhancement
good first issue

After #213 is implemented, we should check to see if `DataSource` really needs `history_len`, `forecast_len`, `_total_seq_len`, `_total_seq_dur`, `_history_dur` and `_forecast_dur`. It's possible that some are no longer needed :slightly_smiling_face: `_total_seq_len`...

enhancement
good first issue
refactoring

https://pytorch.org/docs/stable/named_tensor.html See [this twitter conversation](https://twitter.com/jack_kelly/status/1446475674319994887). In particular, try [extending xarray with a little "accessor" extension](http://xarray.pydata.org/en/stable/internals/extending-xarray.html) like `dataarray.torch.to_tensor()` (as [suggested by Joe Hamman on Twitter](https://twitter.com/HammanHydro/status/1446593959715696640)!) And see [Joe's pull request, which...

enhancement

## Detailed Description Up until the recent introduction of GSP-level PV into `nowcasting_dataset`, we've been dealing entirely with 5-minutely datasets. GSP-level PV is (for now, at least) half-hourly. But, if...

enhancement
data

## Detailed Description Polution, water vapour, aerosols, etc. all affect the passage of sunlight through the atmosphere. Aerosols are mostly (completely?) invisible to EUMETSAT SEVIRI. So it'd be great to...

enhancement
data

We currently only have PV data for the UK. We will at some point want to get PV data for elsewhere but, in the meantime, we'll need nowcasting_dataset to optionally...

enhancement

Remove background satellite image ## Detailed Description Remove background of satellite image by looking at the last 30 days, and removing the mean/min/max or max value. This should be time...

enhancement

v1: Take satelight patch and plot data on it. Might have to overlap a static map on the background. v2: Add nwp data on top