Debug average in fate()

[Sichao25]

Bug description:

• The average option is disabled in the fate().
• It doesn't distinguish the "origin" and "trajectory mode" as described in the docstring.

[codecov-commenter]

Codecov Report

Attention: 8 lines in your changes are missing coverage. Please review.

Comparison is base (e87f702) 22.17% compared to head (eb28841) 22.17%.

Files	Patch %	Lines
dynamo/prediction/fate.py	0.00%	7 Missing ⚠️
dynamo/tools/utils.py	0.00%	1 Missing ⚠️

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Additional details and impacted files

@@           Coverage Diff           @@
##           master     #629   +/-   ##
=======================================
  Coverage   22.17%   22.17%           
=======================================
  Files         166      166           
  Lines       28032    28028    -4     
=======================================
  Hits         6215     6215           
+ Misses      21817    21813    -4     

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