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from fuel.transformers import Transformer, Filter, Mapping
class Select(Transformer):
def __init__(self, data_stream, sources):
super(Select, self).__init__(data_stream)
self.ids = [data_stream.sources.index(source) for source in sources]
self.sources=sources
def get_data(self, request=None):
if request is not None:
raise ValueError
data=next(self.child_epoch_iterator)
return [data[id] for id in self.ids]
def add_extremities(stream, k):
id_polyline=stream.sources.index('polyline')
def extremities(x):
return (x[id_polyline][:k], x[id_polyline][-k:])
stream = Filter(stream, lambda x: len(x[id_polyline])>=k)
stream = Mapping(stream, extremities, ('first_k', 'last_k'))
return stream
def add_destination(stream):
id_polyline=stream.sources.index('polyline')
return Mapping(stream, lambda x: x[id_polyline][-1], ('destination',))
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