backward_inv for MAP on conditional glow

[rafaelorozco]

Also made some changes to logdet outputs to be more consistent.

[codecov]

Codecov Report

Base: 88.09% // Head: 35.06% // Decreases project coverage by -53.02% ⚠️

Coverage data is based on head (240daa9) compared to base (5f571ec).
Patch coverage: 11.68% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff             @@
##           master      #69       +/-   ##
===========================================
- Coverage   88.09%   35.06%   -53.03%     
===========================================
  Files          33       33               
  Lines        2545     2578       +33     
===========================================
- Hits         2242      904     -1338     
- Misses        303     1674     +1371     

Impacted Files	Coverage Δ
src/conditional_layers/conditional_layer_glow.jl	0.00% <0.00%> (-97.73%)	⬇️
src/layers/invertible_layer_glow.jl	0.00% <0.00%> (-97.30%)	⬇️
...rc/networks/invertible_network_conditional_glow.jl	0.00% <0.00%> (-82.90%)	⬇️
src/utils/invertible_network_sequential.jl	88.46% <85.71%> (-1.95%)	⬇️
src/layers/invertible_layer_actnorm.jl	68.23% <100.00%> (-28.24%)	⬇️
src/layers/invertible_layer_basic.jl	80.00% <100.00%> (-13.34%)	⬇️
src/layers/invertible_layer_hint.jl	78.03% <100.00%> (-16.36%)	⬇️
...itional_layers/conditional_layer_residual_block.jl	0.00% <0.00%> (-100.00%)	⬇️
src/conditional_layers/conditional_layer_hint.jl	0.00% <0.00%> (-99.19%)	⬇️
src/layers/invertible_layer_irim.jl	0.00% <0.00%> (-98.12%)	⬇️
... and 24 more

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