Impl. CumlArray.deserialize() (#4965)

The "constructor-kwargs" is being removed in rapidsai/cudf#12009

Authors:
  - Mads R. B. Kristensen (https://github.com/madsbk)

Approvers:
  - Dante Gama Dessavre (https://github.com/dantegd)

URL: #4965

python/cuml/common/array.py

@@ -349,6 +349,15 @@ def serialize(self) -> Tuple[dict, list]:
         frames = [CumlArray(f) for f in frames]
         return header, frames
 
+    @classmethod
+    @nvtx.annotate(message="common.CumlArray.deserialize", category="utils",
+                   domain="cuml_python")
+    def deserialize(cls, header, frames):
+        assert (
+            header["frame_count"] == 1
+        ), "Only expecting to deserialize Buffer with a single frame."
+        return cls(frames[0], **header["constructor-kwargs"])
+
     @nvtx.annotate(message="common.CumlArray.to_host_array", category="utils",
                    domain="cuml_python")
     def to_host_array(self):