create demo undocumented numpy function

test_scripts/demo.py

@@ -0,0 +1,33 @@
+import numpy as np
+
+
+def one_hot(
+    indices,
+    depth,
+    on_value = None,
+    off_value = None,
+    axis = None,
+    dtype = None,
+):
+    on_none = on_value is None
+    off_none = off_value is None
+
+    if dtype is None:
+        if on_none and off_none:
+            dtype = np.float32
+        else:
+            if not on_none:
+                dtype = np.array(on_value).dtype
+            elif not off_none:
+                dtype = np.array(off_value).dtype
+
+    res = np.eye(depth, dtype=dtype)[np.array(indices, dtype="int64").reshape(-1)]
+    res = res.reshape(list(indices.shape) + [depth])
+
+    if not on_none and not off_none:
+        res = np.where(res == 1, on_value, off_value)
+
+    if axis is not None:
+        res = np.moveaxis(res, -1, axis)
+
+    return res