from fuel.transformers import Transformer, Filter, Mapping
import numpy
import theano
import random
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_first_k(k, stream):
id_polyline=stream.sources.index('polyline')
def first_k(x):
return (numpy.array(x[id_polyline][:k], dtype=theano.config.floatX).flatten(),)
stream = Filter(stream, lambda x: len(x[id_polyline])>=k)
stream = Mapping(stream, first_k, ('first_k',))
return stream
def add_random_k(k, stream):
id_polyline=stream.sources.index('polyline')
def random_k(x):
loc = random.randrange(len(x[id_polyline])-k+1)
return (numpy.array(x[id_polyline][loc:loc+k], dtype=theano.config.floatX).flatten(),)
stream = Filter(stream, lambda x: len(x[id_polyline])>=k)
stream = Mapping(stream, random_k, ('last_k',))
return stream
def add_destination(stream):
id_polyline=stream.sources.index('polyline')
return Mapping(stream, lambda x: (numpy.array(x[id_polyline][-1], dtype=theano.config.floatX),), ('destination',))
