wrong codeBLEU metric value

[poojitharamachandra]

Hi,

I am comparing the code lines:

codeline1= 'a = !((f >> 4) & 0x01);'
codeline2= 'a=!(((f >> 4) & 1U)!=0?true:false;)'

the metric is
CodeBLEU score: {'codebleu': 0.4474481492943273, 'ngram_match_score': 0.21711852081087685, 'weighted_ngram_match_score': 0.21711852081087685, 'syntax_match_score': 0.5555555555555556, 'dataflow_match_score': 0.8}

When the change the code to
codeline2='a=!(((f >> 4) & 1U)!=0?false:true;)'
the metric is
CodeBLEU score: {'codebleu': 0.4474481492943273, 'ngram_match_score': 0.21711852081087685, 'weighted_ngram_match_score': 0.21711852081087685, 'syntax_match_score': 0.5555555555555556, 'dataflow_match_score': 0.8}

I expected the dataflow match score to change, as the functionality is changed