[advanced][databases][livdet-iris-2020] Add new version following V2 implementation

advanced/databases/livdet-iris-2020/2.json

+{
+    "description": "LivDet Iris 2020 test database",
+    "environment": {
+        "name": "Example databases",
+        "version": "1.4.1"
+    },
+    "protocols": [
+        {
+            "name": "Main",
+            "template": "iris_pad/1",
+            "views": {
+                "test": {
+                    "view": "Test",
+                    "parameters": {}
+                }
+            }
+        }
+    ],
+    "root_folder": "/somewhere",
+    "schema_version": 2
+}
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advanced/databases/livdet-iris-2020/2.py

+import os
+
+import numpy as np
+import pandas as pd
+from beat.backend.python.database import View
+from PIL import Image
+
+
+class Test(View):
+    def index(self, root_folder, parameters):
+        """Creates the data for the database indexation"""
+
+        csv_path = os.path.join(root_folder, "test.csv")
+        df = pd.read_csv(csv_path)
+
+        df["filename"] = df["filename"].apply(lambda x: os.path.join(root_folder, x))
+        df = df.rename(columns={"filename": "image"})
+
+        # ------------- v1 random labels -----
+        # remove this part for v2 release
+        num_files = len(df)
+        np.random.seed(0)
+        df["label"] = np.random.randint(0, 2, size=num_files, dtype=bool)
+        df["category"] = np.random.randint(1, 7, size=num_files, dtype=int)
+        # ------------------------------------
+
+        return list(df.itertuples(index=False))
+
+    def get(self, output, index):
+        """Returns the data for the output based on the index content"""
+
+        obj = self.objs[index]
+
+        if output == "image":
+            img = np.asarray(Image.open(obj.image))
+            return {"value": img}
+        elif output == "label":
+            return {"value": bool(obj.label)}
+        elif output == "category":
+            return {"value": np.cast["int32"](obj.category)}

advanced/databases/livdet-iris-2020/2.rst

+LivDet Iris 2020 test database
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