udapi.block.util.filter module

Filter is a special block for keeping/deleting subtrees specified by parameters.

class udapi.block.util.filter.Filter(delete_tree=None, delete_tree_if_node=None, delete_subtree=None, keep_tree=None, keep_tree_if_node=None, keep_subtree=None, keep_node=None, mark=None, **kwargs)

Bases: Block

Special block for keeping/deleting subtrees specified by parameters.

Example usage from command line: # extract subtrees governed by nouns (noun phrases) udapy -s util.Filter keep_subtree=’node.upos == “NOUN”’ < in.conllu > filtered.conllu

# keep only trees which contain ToDo|Bug nodes udapy -s util.Filter keep_tree_if_node=’re.match(“ToDo|Bug”, str(node.misc))’ < in > filtered

# keep only non-projective trees, annotate non-projective edges with Mark=nonproj and show. udapy -T util.Filter keep_tree_if_node=’node.is_nonprojective()’ mark=nonproj < in | less -R

# delete trees which contain deprel=remnant udapy -s util.Filter delete_tree_if_node=’node.deprel == “remnant”’ < in > filtered

# delete subtrees headed by a node with deprel=remnant udapy -s util.Filter delete_subtree=’node.deprel == “remnant”’ < in > filtered

process_tree(tree)

Process a UD tree