fix: reduce tfkeras iris const batch size

[garrett361]

Description

The current const.yaml configuration fails due to a too-large global batch size. This PR reduces the global batch size.

Test Plan

Run det e create const.yaml . from within the examples/computer_vision/iris_tf_keras dir and verify that the trial runs without failing.

Commentary (optional)

Original error message pre-fix:

[2024-01-03 18:48:56]
[ac93e99e] Traceback (most recent call last): <none> [2024-01-03 18:48:56]
[ac93e99e]   File "/opt/conda/lib/python3.9/runpy.py", line 197, in _run_module_as_main <none> [2024-01-03 18:48:56]
[ac93e99e]     return _run_code(code, main_globals, None, <none> [2024-01-03 18:48:56]
[ac93e99e]   File "/opt/conda/lib/python3.9/runpy.py", line 87, in _run_code <none> [2024-01-03 18:48:56]
[ac93e99e]     exec(code, run_globals) <none> [2024-01-03 18:48:56]
[ac93e99e]   File "/run/determined/pythonuserbase/lib/python3.9/site-packages/determined/exec/harness.py", line 210, in <module> <none> [2024-01-03 18:48:56]
[ac93e99e]     sys.exit(main(args.train_entrypoint)) <none> [2024-01-03 18:48:56]
[ac93e99e]   File "/run/determined/pythonuserbase/lib/python3.9/site-packages/determined/exec/harness.py", line 125, in main <none> [2024-01-03 18:48:56]
[ac93e99e]     controller = controller_class.from_trial( <none> [2024-01-03 18:48:56]
[ac93e99e]   File "/run/determined/pythonuserbase/lib/python3.9/site-packages/determined/keras/_tf_keras_trial.py", line 295, in from_trial <none> [2024-01-03 18:48:56]
[ac93e99e]     validation_data = keras._adapt_data_from_data_loader( <none> [2024-01-03 18:48:56]
[ac93e99e]   File "/run/determined/pythonuserbase/lib/python3.9/site-packages/determined/keras/_data.py", line 190, in _adapt_data_from_data_loader <none> [2024-01-03 18:48:56]
[ac93e99e]     return _ArrayLikeAdapter(x, y, batch_size, sample_weight) <none> [2024-01-03 18:48:56]
[ac93e99e]   File "/run/determined/pythonuserbase/lib/python3.9/site-packages/determined/keras/_data.py", line 103, in __init__ <none> [2024-01-03 18:48:56]
[ac93e99e]     check.check_gt_eq(self._x_length, batch_size, "Batch size is too large for the input data.") <none> [2024-01-03 18:48:56]
[ac93e99e]   File "/run/determined/pythonuserbase/lib/python3.9/site-packages/determined/common/check.py", line 151, in check_gt_eq <none> [2024-01-03 18:48:56]
[ac93e99e]     return gt_eq(x, y, reason) <none> [2024-01-03 18:48:56]
[ac93e99e]   File "/run/determined/pythonuserbase/lib/python3.9/site-packages/determined/common/check.py", line 147, in gt_eq <none> [2024-01-03 18:48:56]
[ac93e99e]     raise CheckFailedError(msg) <none> [2024-01-03 18:48:56]
[ac93e99e] determined.common.check.CheckFailedError: CHECK FAILED! Got 30, expected value >= 32: Batch size is too large for the input data. 

Checklist

• Changes have been manually QA'd
• User-facing API changes need the "User-facing API Change" label.
• Release notes should be added as a separate file under docs/release-notes/.
  See Release Note for details.
• Licenses should be included for new code which was copied and/or modified from any external code.

Ticket

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