fix(zzh): IBC minor fix.

[ZHZisZZ]

Remove redundant leaf nodes (action samples) from computation graph;

Correct function name from _langevin_action_gives_obs to _langevin_action_given_obs.

Description

Related Issue

TODO

Check List

• merge the latest version source branch/repo, and resolve all the conflicts
• pass style check
• pass all the tests

[codecov]

Codecov Report

Merging #477 (64aeb17) into main (d289dee) will decrease coverage by 0.06%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #477      +/-   ##
==========================================
- Coverage   85.73%   85.66%   -0.07%     
==========================================
  Files         537      537              
  Lines       42992    42994       +2     
==========================================
- Hits        36859    36832      -27     
- Misses       6133     6162      +29     

Flag	Coverage Δ
unittests	85.66% <100.00%> (-0.07%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
ding/model/template/ebm.py	94.44% <100.00%> (+0.05%)	⬆️
ding/model/template/tests/test_ebm.py	100.00% <100.00%> (ø)
ding/framework/message_queue/tests/test_nng.py	73.07% <0.00%> (-26.93%)	⬇️
ding/worker/learner/comm/flask_fs_learner.py	83.12% <0.00%> (-8.13%)	⬇️
ding/utils/data/dataloader.py	44.55% <0.00%> (-2.60%)	⬇️
ding/utils/tests/test_k8s_launcher.py	88.67% <0.00%> (-1.89%)	⬇️
ding/worker/collector/marine_parallel_collector.py	89.86% <0.00%> (-1.39%)	⬇️
ding/worker/learner/tests/test_base_learner.py	91.01% <0.00%> (-1.13%)	⬇️
ding/framework/tests/test_parallel.py	96.26% <0.00%> (-0.94%)	⬇️
ding/envs/env_manager/subprocess_env_manager.py	76.96% <0.00%> (+0.39%)	⬆️

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