Add GIST1M to datasets

Summary: GIST1M is on the fair cluster but was not added to the datsets.py

Reviewed By: alexanderguzhva

Differential Revision: D45276664

fbshipit-source-id: 8db41d61b78983f5d01dedca1790618f80f6bc78

Author: mdouze

contrib/datasets.py

@@ -311,6 +311,33 @@ def get_groundtruth(self, k=None):
             gt = gt[:, :k]
         return gt
 
+class DatasetGIST1M(Dataset):
+    """
+    The original dataset is available at: http://corpus-texmex.irisa.fr/
+    (ANN_SIFT1M)
+    """
+
+    def __init__(self):
+        Dataset.__init__(self)
+        self.d, self.nt, self.nb, self.nq = 960, 100000, 1000000, 10000
+        self.basedir = dataset_basedir + 'gist1M/'
+
+    def get_queries(self):
+        return fvecs_read(self.basedir + "gist_query.fvecs")
+
+    def get_train(self, maxtrain=None):
+        maxtrain = maxtrain if maxtrain is not None else self.nt
+        return fvecs_read(self.basedir + "gist_learn.fvecs")[:maxtrain]
+
+    def get_database(self):
+        return fvecs_read(self.basedir + "gist_base.fvecs")
+
+    def get_groundtruth(self, k=None):
+        gt = ivecs_read(self.basedir + "gist_groundtruth.ivecs")
+        if k is not None:
+            assert k <= 100
+            gt = gt[:, :k]
+        return gt
 
 
 def dataset_from_name(dataset='deep1M', download=False):
@@ -321,6 +348,9 @@ def dataset_from_name(dataset='deep1M', download=False):
     if dataset == 'sift1M':
         return DatasetSIFT1M()
 
+    elif dataset == 'gist1M':
+        return DatasetGIST1M()
+
     elif dataset.startswith('bigann'):
         dbsize = 1000 if dataset == "bigann1B" else int(dataset[6:-1])
         return DatasetBigANN(nb_M=dbsize)