[Major] Throw RuntimeError when trying to fit model second time (Fixes #1493)

[ourownstory]

see #1493

[github-actions]

Model Benchmark

Benchmark	Metric	main	current	diff
YosemiteTemps	MAE_val	0.64178	0.64178	0.0%	✅
YosemiteTemps	RMSE_val	0.92787	0.92787	0.0%	✅
YosemiteTemps	Loss_val	0.0005	0.0005	0.0%	✅
YosemiteTemps	MAE	1.092	1.092	0.0%	✅
YosemiteTemps	RMSE	1.89124	1.89124	0.0%	✅
YosemiteTemps	Loss	0.00155	0.00155	0.0%	✅
YosemiteTemps	time	62.3085	63.88	2.52%	✅
EnergyPriceDaily	MAE_val	5.55889	5.55889	0.0%	✅
EnergyPriceDaily	RMSE_val	7.12233	7.12233	0.0%	✅
EnergyPriceDaily	Loss_val	0.02829	0.02829	0.0%	✅
EnergyPriceDaily	MAE	6.37172	6.37172	0.0%	✅
EnergyPriceDaily	RMSE	8.53016	8.53016	0.0%	✅
EnergyPriceDaily	Loss	0.02907	0.02907	0.0%	✅
EnergyPriceDaily	time	15.6183	16.4	5.0%	⚠️
PeytonManning	MAE_val	0.3466	0.3466	0.0%	✅
PeytonManning	RMSE_val	0.49808	0.49808	0.0%	✅
PeytonManning	Loss_val	0.01752	0.01752	0.0%	✅
PeytonManning	MAE	0.34735	0.34735	0.0%	✅
PeytonManning	RMSE	0.48788	0.48788	0.0%	✅
PeytonManning	Loss	0.01457	0.01457	0.0%	✅
PeytonManning	time	21.979	22.49	2.32%	✅
AirPassengers	MAE_val	31.6337	31.6337	0.0%	✅
AirPassengers	RMSE_val	32.6669	32.6669	0.0%	✅
AirPassengers	Loss_val	0.01372	0.01372	0.0%	✅
AirPassengers	MAE	6.24136	6.24136	0.0%	✅
AirPassengers	RMSE	7.82928	7.82928	0.0%	✅
AirPassengers	Loss	0.00063	0.00063	0.0%	✅
AirPassengers	time	10.8195	11.39	5.27%	⚠️

Model training plots

Model Training

PeytonManning

YosemiteTemps

AirPassengers

EnergyPriceDaily

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (305de42) 88.41% compared to head (4bb27eb) 88.40%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1531      +/-   ##
==========================================
- Coverage   88.41%   88.40%   -0.02%     
==========================================
  Files          38       38              
  Lines        5103     5105       +2     
==========================================
+ Hits         4512     4513       +1     
- Misses        591      592       +1     

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