From 1f2ff96e6480a62089fcac35154a956c218ed678 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C3=89tienne=20Simon?= <esimon@esimon.eu>
Date: Tue, 5 May 2015 21:55:13 -0400
Subject: Clean data module and generalize use of hdf5.

---
 data/transformers.py | 127 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 127 insertions(+)
 create mode 100644 data/transformers.py

(limited to 'data/transformers.py')

diff --git a/data/transformers.py b/data/transformers.py
new file mode 100644
index 0000000..1cc4834
--- /dev/null
+++ b/data/transformers.py
@@ -0,0 +1,127 @@
+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', '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 TaxiAddFirstK(Transformer):
+    def __init__(self, k, stream):
+        super(TaxiAddFirstK, self).__init__(stream)
+        self.sources = stream.sources + ('first_k_latitude', 'first_k_longitude')
+        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))
+        return data + first_k
+
+class TaxiAddLastK(Transformer):
+    def __init__(self, k, stream):
+        super(TaxiAddLastK, self).__init__(stream)
+        self.sources = stream.sources + ('last_k_latitude', 'last_k_longitude')
+        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)
+        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))
+        return data + last_k
+
+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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