[advanced][experiments] Add simple experiment to test GPU setup

advanced/experiments/username/username/gpu_test/1/gpu_test.json

+{
+    "blocks": {
+        "block_1": {
+            "outputs": {
+                "scores": "scores"
+            },
+            "algorithm": "{{ user.username }}/gpu_test/1",
+            "inputs": {
+                "client_id": "input"
+            }
+        }
+    },
+    "globals": {
+        "queue": "{{ queue }}",
+        "{{ user.username }}/gpu_test/1": {
+            "offset": 10
+        },
+        "environment": {
+            "version": "0.0.1",
+            "name": "Pytorch 0.4.0"
+        }
+    },
+    "analyzers": {
+        "analyzer_1": {
+            "nb_slots": 1,
+            "algorithm": "{{ user.username }}/postperf_iso/1",
+            "inputs": {
+                "scores": "scores"
+            },
+            "queue": "{{ queue }}",
+            "environment": {
+                "version": "{{ environment.version }}",
+                "name": "{{ environment.name }}"
+            }
+        }
+    },
+    "datasets": {
+        "templates": {
+            "set": "templates",
+            "protocol": "idiap",
+            "database": "atnt/5"
+        }
+    }
+}
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