[advanced][algorithms] Add basic GPU using algorithm

advanced/algorithms/username/gpu_test/1.json

+{
+    "type": "sequential",
+    "groups": [
+        {
+            "outputs": {
+                "scores": {
+                    "type": "{{ user.username }}/probe_scores/1"
+                }
+            },
+            "inputs": {
+                "client_id": {
+                    "type": "{{ system_user.username }}/uint64/1"
+                }
+            },
+            "name": "main"
+        }
+    ],
+    "parameters": {
+        "offset": {
+            "type": "uint32",
+            "default": 10,
+            "description": "Offset"
+        }
+    },
+    "schema_version": 2,
+    "api_version": 2,
+    "description": "",
+    "splittable": false,
+    "language": "python"
+}

advanced/algorithms/username/gpu_test/1.py

+###############################################################################
+#                                                                             #
+# Copyright (c) 2019 Idiap Research Institute, http://www.idiap.ch/           #
+# Contact: beat.support@idiap.ch                                              #
+#                                                                             #
+# This file is part of the beat.examples module of the BEAT platform.         #
+#                                                                             #
+# Commercial License Usage                                                    #
+# Licensees holding valid commercial BEAT licenses may use this file in       #
+# accordance with the terms contained in a written agreement between you      #
+# and Idiap. For further information contact tto@idiap.ch                     #
+#                                                                             #
+# Alternatively, this file may be used under the terms of the GNU Affero      #
+# Public License version 3 as published by the Free Software and appearing    #
+# in the file LICENSE.AGPL included in the packaging of this file.            #
+# The BEAT platform is distributed in the hope that it will be useful, but    #
+# WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY  #
+# or FITNESS FOR A PARTICULAR PURPOSE.                                        #
+#                                                                             #
+# You should have received a copy of the GNU Affero Public License along      #
+# with the BEAT platform. If not, see http://www.gnu.org/licenses/.           #
+#                                                                             #
+###############################################################################
+
+import numpy
+import torch
+
+class Algorithm:
+
+    def __init__(self):
+        self.offset = 1
+
+    def setup(self, parameters):
+        self.offset = numpy.asscalar(parameters['offset'])
+        return torch.cuda.is_available()
+
+    def process(self, inputs, data_loaders, outputs):
+        client_id = inputs['client_id'].data.value
+
+        x = torch.FloatTensor(1, 1).fill_(numpy.asscalar(client_id)).cuda()
+        y = torch.FloatTensor(1, 1).fill_(self.offset).cuda()
+        z = x + y
+        score = z.cpu().numpy().astype(numpy.int32)[0][0]
+
+        scores = [
+            {
+                'template_identity': client_id,
+                'score': score if client_id % 2 else -score
+            },
+            {
+                'template_identity': 0,
+                'score': -score if client_id % 2 else score
+            }
+        ]
+
+        outputs['scores'].write({
+          'client_identity': client_id,
+          'scores': scores
+          })
+
+        return True

advanced/algorithms/username/gpu_test/1.rst

+.. Copyright (c) 2019 Idiap Research Institute, http://www.idiap.ch/          ..
+.. Contact: beat.support@idiap.ch                                             ..
+..                                                                            ..
+.. This file is part of the beat.examples module of the BEAT platform.        ..
+..                                                                            ..
+.. Commercial License Usage                                                   ..
+.. Licensees holding valid commercial BEAT licenses may use this file in      ..
+.. accordance with the terms contained in a written agreement between you     ..
+.. and Idiap. For further information contact tto@idiap.ch                    ..
+..                                                                            ..
+.. Alternatively, this file may be used under the terms of the GNU Affero     ..
+.. Public License version 3 as published by the Free Software and appearing   ..
+.. in the file LICENSE.AGPL included in the packaging of this file.           ..
+.. The BEAT platform is distributed in the hope that it will be useful, but   ..
+.. WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY ..
+.. or FITNESS FOR A PARTICULAR PURPOSE.                                       ..
+..                                                                            ..
+.. You should have received a copy of the GNU Affero Public License along     ..
+.. with the BEAT platform. If not, see http://www.gnu.org/licenses/.          ..
+
+
+Minimal algorithm validating GPU setup.
\ No newline at end of file

test/algorithms/username/integers_add_torch_autonomous/1.json

@@ -20,7 +20,7 @@
     ],
     "parameters": {
         "offset": {
-            "default": "1",
+            "default": 1,
             "type": "int32"
         }
     },

test/algorithms/username/integers_add_torch_legacy/1.json

@@ -18,7 +18,7 @@
     ],
     "parameters": {
         "offset": {
-            "default": "1",
+            "default": 1,
             "type": "int32"
         }
     },

test/algorithms/username/integers_add_torch_sequential/1.json

@@ -20,7 +20,7 @@
     ],
     "parameters": {
         "offset": {
-            "default": "1",
+            "default": 1,
             "type": "int32"
         },
         "sync": {