With no explanation, label each line with "O", "person-other", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
Walsh
is
considered
by
many
to
be
the
father
of
neuro-ophthalmology
due
to
his
contributions
to
the
field
.
Walsh:person-other
is:O
considered:O
by:O
many:O
to:O
be:O
the:O
father:O
of:O
neuro-ophthalmology:O
due:O
to:O
his:O
contributions:O
to:O
the:O
field:O
.:O