Enable lstripBlocks and trimBlocks options for chat templates#12
Merged
DePasqualeOrg merged 1 commit intomainfrom Mar 4, 2026
Merged
Enable lstripBlocks and trimBlocks options for chat templates#12DePasqualeOrg merged 1 commit intomainfrom
DePasqualeOrg merged 1 commit intomainfrom
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Aligns with Python transformers, which creates its Jinja environment with trim_blocks=True, lstrip_blocks=True. Cherry-picked from huggingface/swift-transformers#323 (4f6c72b). Co-authored-by: Sachin Desai <smdesai@gmail.com>
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Cherry-pick of upstream #323.
Problem
Chat templates with Jinja block tags (
{% for %},{% if %}, etc.) produced extra whitespace and newlines in the rendered output. Templates that worked correctly in Python produced different results in Swift.Fix
Pass
lstripBlocks: trueandtrimBlocks: truewhen compiling Jinja templates, matching Pythontransformerswhich creates its Jinja environment withtrim_blocks=True, lstrip_blocks=True(inchat_template_utils.py).Our swift-jinja dependency (>= 2.0.0) already supports these options via
EnvironmentConfig.Changes
PreTrainedTokenizer.compiledTemplate(for:):Template(templateString)→Template(templateString, with: .init(lstripBlocks: true, trimBlocks: true))