Commit 30cf6f18 authored by Derek Murray's avatar Derek Murray Committed by TensorFlower Gardener
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Free `MasterSession::ReffedClientGraph::client_graph_` after it is no longer used. 

The `ClientGraph` represents the post-pruning, pre-partitioning subgraph. It is not used at the master after partitioning concludes. A redundant copy is stored in the workers' memories (post-partitioning). This change releases the memory for the `ClientGraph` after partitioning concludes.

PiperOrigin-RevId: 221008316
parent 982ddb4e
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