Added reference results.

Author: petermattson

reference_results.md

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+The following table shows reference results, to be used to normalized benchmark results. 
+**These results are NOT for optimized code and do NOT measure framework or hardware performance.**
+Individual seed results are provided only to show variance and should not be used for normalization.
+
+Benchmark|Reference Result|Seed 1|Seed 2|Seed 3|Seed 4|Seed 5
+---|---|---|---|---|---|---
+Image classification|529877|530571|529438|530373|523480|529877
+Object detection|299971|298906|299971|300471|298915|327101
+Translation|112187|111790|112187|111760|112879|149175
+Speech recognition|412417|405780|532790|450667|412417|344806
+Recommendation|2803|2823|2802|2803|2912|2541
+Sentiment analysis|214|287|207|210|214|324
+Reinforcement learning|263322|279252|277831|223113|260951|263322