change to type Any for batch argument

[ydcjeff]

What does this PR do?

Fixes # #444 (review)

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[codecov]

Codecov Report

Merging #495 (f1d7cc5) into master (ce3187d) will decrease coverage by 53.53%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           master     #495       +/-   ##
===========================================
- Coverage   79.10%   25.57%   -53.54%     
===========================================
  Files         102      102               
  Lines        5921     5900       -21     
===========================================
- Hits         4684     1509     -3175     
- Misses       1237     4391     +3154     

Flag	Coverage Δ
cpu	25.57% <100.00%> (ø)
pytest	25.57% <100.00%> (ø)
unittests	?

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

Impacted Files	Coverage Δ
pl_bolts/callbacks/data_monitor.py	40.70% <100.00%> (-46.91%)	⬇️
pl_bolts/models/rl/common/agents.py	0.00% <0.00%> (-100.00%)	⬇️
pl_bolts/models/rl/dueling_dqn_model.py	0.00% <0.00%> (-100.00%)	⬇️
...l_bolts/models/rl/vanilla_policy_gradient_model.py	0.00% <0.00%> (-96.37%)	⬇️
pl_bolts/models/rl/double_dqn_model.py	0.00% <0.00%> (-95.66%)	⬇️
pl_bolts/models/rl/common/gym_wrappers.py	0.00% <0.00%> (-91.60%)	⬇️
pl_bolts/models/rl/reinforce_model.py	0.00% <0.00%> (-89.35%)	⬇️
pl_bolts/models/rl/common/networks.py	0.00% <0.00%> (-89.25%)	⬇️
pl_bolts/models/rl/__init__.py	0.00% <0.00%> (-88.89%)	⬇️
pl_bolts/models/rl/per_dqn_model.py	0.00% <0.00%> (-86.67%)	⬇️
... and 56 more

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