[data] init DSSDisk

data.py

@@ -232,3 +232,12 @@ class DSS(SKDict):
                 remove(path.join(dir, fn))
         for key, value in self.items():
             np.save(path.join(dir, "%s.npy" % sep.join(sorted(key))), value, **kwargs)
+
+
+class DSSDisk(DSS):
+    def __setitem__(self, key, value):
+        if isinstance(value, np.ndarray) and not isinstance(value, np.memmap):
+            with tempfile.NamedTemporaryFile() as tmp_file:
+                np.save(tmp_file, value)
+                value = np.load(tmp_file.name, mmap_mode="r+")
+        return super().__setitem__(key, value)