deep_learning: model is moved to cpu before saving #435

Job	Run time
Documentation	4m 30s
Julia 1.7 - ubuntu-latest - x64 - push	9m 30s
Julia 1.7 - ubuntu-latest - x64 - push	7m 24s
Julia 1.7 - macOS-latest - x64 - push	7m 45s
Julia 1.7 - macOS-latest - x64 - push	10m 54s
Julia 1.7 - windows-latest - x64 - push	12m 27s
Julia 1.7 - windows-latest - x64 - push	9m 40s
Julia 1.8 - ubuntu-latest - x64 - push	7m 31s
Julia 1.8 - ubuntu-latest - x64 - push	7m 9s
Julia 1.8 - macOS-latest - x64 - push	6m 44s
Julia 1.8 - macOS-latest - x64 - push	8m 50s
Julia 1.8 - windows-latest - x64 - push	9m 56s
Julia 1.8 - windows-latest - x64 - push	10m 3s
Julia 1.9 - ubuntu-latest - x64 - push	7m 17s
Julia 1.9 - ubuntu-latest - x64 - push	5m 30s
Julia 1.9 - macOS-latest - x64 - push	8m 47s
Julia 1.9 - macOS-latest - x64 - push	7m 40s
Julia 1.9 - windows-latest - x64 - push	7m 37s
Julia 1.9 - windows-latest - x64 - push	9m 15s
Julia nightly - ubuntu-latest - x64 - push	31s
Julia nightly - macOS-latest - x64 - push	48s
Julia nightly - windows-latest - x64 - push	1m 15s
	2h 41m 3s

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