polish license (#300)

* init shard param from shape tuple

* add more unitest for shard param

LICENSE

@@ -1,3 +1,4 @@
+Copyright 2021- The Colossal-ai Authors. All rights reserved.
                                  Apache License
                            Version 2.0, January 2004
                         http://www.apache.org/licenses/
@@ -199,3 +200,25 @@
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    limitations under the License.
+
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