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[FIX] Use float64 in gradient_and_loss test, convert BCE targets in change_dtype

The gradient_and_loss test was using float32 which caused flaky
precision failures. Convert to float64 like other tests. Also fix
change_dtype to convert BCEWithLogitsLoss targets (now soft labels).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>