fix torch.mean(auc) and updating model init in utils.py

[ParthaPratimBanik]

Fixed issue #85

• [x] The argument of torch.mean(), toch.std(), and torch.max() should be a tensor float type instead of list.
• [x] eval_recall_at_k() return tensor float type value, it must convert to list type float value to append into the rec list. \ \ Fixed issue #83
• [x] Remove heuristic selection of weight.
• [x] Update the parameter name for detectors (DOMINANT, GAAN, and CONAD) from alpha to weight.

Issues #83, #85, and the above solutions are tested on torch 2.0.1+cu117.

[coveralls]

Pull Request Test Coverage Report for Build 5890522716

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 99.562%

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Totals
Change from base Build 5709379320:	0.0%
Covered Lines:	2503
Relevant Lines:	2514

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💛 - Coveralls