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import datetime
import random
import numpy
import theano
from fuel.transformers import Transformer
import data
def at_least_k(k, v, pad_at_begin, is_longitude):
if len(v) == 0:
v = numpy.array([data.porto_center[1 if is_longitude else 0]], dtype=theano.config.floatX)
if len(v) < k:
if pad_at_begin:
v = numpy.concatenate((numpy.full((k - len(v),), v[0]), v))
else:
v = numpy.concatenate((v, numpy.full((k - len(v),), v[-1])))
return v
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]
class TaxiGenerateSplits(Transformer):
def __init__(self, data_stream, max_splits=-1):
super(TaxiGenerateSplits, self).__init__(data_stream)
self.sources = data_stream.sources + ('destination_latitude', 'destination_longitude', 'travel_time')
self.max_splits = max_splits
self.data = None
self.splits = []
self.isplit = 0
self.id_latitude = data_stream.sources.index('latitude')
self.id_longitude = data_stream.sources.index('longitude')
def get_data(self, request=None):
if request is not None:
raise ValueError
while self.isplit >= len(self.splits):
self.data = next(self.child_epoch_iterator)
self.splits = range(len(self.data[self.id_longitude]))
random.shuffle(self.splits)
if self.max_splits != -1 and len(self.splits) > self.max_splits:
self.splits = self.splits[:self.max_splits]
self.isplit = 0
i = self.isplit
self.isplit += 1
n = self.splits[i]+1
r = list(self.data)
r[self.id_latitude] = numpy.array(r[self.id_latitude][:n], dtype=theano.config.floatX)
r[self.id_longitude] = numpy.array(r[self.id_longitude][:n], dtype=theano.config.floatX)
dlat = numpy.float32(self.data[self.id_latitude][-1])
dlon = numpy.float32(self.data[self.id_longitude][-1])
return tuple(r + [dlat, dlon, 15 * (len(self.data[self.id_longitude]) - 1)])
class TaxiAddFirstLastLen(Transformer):
def __init__(self, k, stream):
super(TaxiAddFirstLastLen, self).__init__(stream)
self.sources = stream.sources + ('first_k_latitude', 'first_k_longitude',
'last_k_latitude', 'last_k_longitude',
'input_time')
self.id_latitude = stream.sources.index('latitude')
self.id_longitude = stream.sources.index('longitude')
self.k = k
def get_data(self, request=None):
if request is not None: raise ValueError
data = next(self.child_epoch_iterator)
first_k = (numpy.array(at_least_k(self.k, data[self.id_latitude], False, False)[:self.k],
dtype=theano.config.floatX),
numpy.array(at_least_k(self.k, data[self.id_longitude], False, True)[:self.k],
dtype=theano.config.floatX))
last_k = (numpy.array(at_least_k(self.k, data[self.id_latitude], True, False)[-self.k:],
dtype=theano.config.floatX),
numpy.array(at_least_k(self.k, data[self.id_longitude], True, True)[-self.k:],
dtype=theano.config.floatX))
input_time = (15 * (len(data[self.id_latitude]) - 1),)
return data + first_k + last_k + input_time
class TaxiAddDateTime(Transformer):
def __init__(self, stream):
super(TaxiAddDateTime, self).__init__(stream)
self.sources = stream.sources + ('week_of_year', 'day_of_week', 'qhour_of_day')
self.id_timestamp = stream.sources.index('timestamp')
def get_data(self, request=None):
if request is not None: raise ValueError
data = next(self.child_epoch_iterator)
ts = data[self.id_timestamp]
date = datetime.datetime.utcfromtimestamp(ts)
yearweek = date.isocalendar()[1] - 1
info = ((51 if yearweek == 52 else yearweek), date.weekday(), date.hour * 4 + date.minute / 15)
return data + info
class TaxiExcludeTrips(Transformer):
def __init__(self, exclude_list, stream):
super(TaxiExcludeTrips, self).__init__(stream)
self.id_trip_id = stream.sources.index('trip_id')
self.exclude = {v: True for v in exclude_list}
def get_data(self, request=None):
if request is not None: raise ValueError
while True:
data = next(self.child_epoch_iterator)
if not data[self.id_trip_id] in self.exclude: break
return data
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