<put algortithm description here>
<put parameter description here>
Default: none
<put parameter description here>
Default: False
<put parameter description here>
Default: False
Optional.
<put parameter description here>
Default: (not set)
processing.runalg('gdalogr:cliprasterbymasklayer', input, mask, no_data, alpha_band, keep_resolution, extra, output)