[Repo Assist] fix(refuters): correct num_simulations in DataSubsetRefuter log message

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Problem

refute_data_subset() in data_subset_refuter.py logged a misleading message:

logger.info(
    "Refutation over {} simulated datasets of size {} each".format(
        subset_fraction, subset_fraction * len(data.index)   # ← bug: subset_fraction ≠ count
    )
)

The first {} was filled with subset_fraction (e.g. 0.8), producing nonsensical output like:

Refutation over 0.8 simulated datasets of size 800.0 each

Compare the identical message in bootstrap_refuter.py:218 which correctly uses num_simulations as the first argument.

Fix

Swap the first positional argument from subset_fraction to num_simulations:

logger.info(
    "Refutation over {} simulated datasets of size {} each".format(
        num_simulations, subset_fraction * len(data.index)   # ← fixed
    )
)

This now produces the intended message, e.g.:

Refutation over 100 simulated datasets of size 800.0 each

Root Cause

Copy-paste from bootstrap_refuter.py, where both size-related variables are positional. In data_subset_refuter.py the two variables have different semantic roles and subset_fraction was accidentally kept in the first slot.

Changes

• dowhy/causal_refuters/data_subset_refuter.py: one-line fix (line 122)

Test Status

⚠️ Infrastructure limitation: dev dependencies are not installed in this CI environment, so tests could not be run. The change is a single-argument swap in a logger.info() call with no logic impact. The existing tests/test_causal_refuters.py exercises DataSubsetRefuter and will confirm no regressions in CI.

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