Add forward to training servicer #193

Job	Run time
test-dev	2m 59s
test-dev	3m 3s
conda-noarch-build	1m 43s
conda-noarch-build	1m 48s
Pre-Commit Check	1m 42s
Pre-Commit Check	1m 41s
test-build-conda-packages (macos-latest)	1m 14s
test-build-conda-packages (macos-latest)	1m 25s
test-build-conda-packages (windows-latest)	2m 17s
test-build-conda-packages (windows-latest)	2m 23s
test-build-conda-packages (ubuntu-latest)	48s
test-build-conda-packages (ubuntu-latest)	29s
	21m 32s

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