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Improve error message when oracle fails for non-projective trees, re Issue #571.

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Matthew Honnibal 2016-10-24 20:31:30 +02:00
parent b2d43b93d2
commit a209b10579
1 changed files with 18 additions and 0 deletions
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18
spacy/syntax/arc_eager.pyx
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@ -19,6 +19,7 @@ from cymem.cymem cimport Pool
from .stateclass cimport StateClass from .stateclass cimport StateClass
from ._state cimport StateC, is_space_token from ._state cimport StateC, is_space_token
from .nonproj import PseudoProjectivity from .nonproj import PseudoProjectivity
from .nonproj import is_nonproj_tree
DEF NON_MONOTONIC = True DEF NON_MONOTONIC = True
@ -442,4 +443,21 @@ cdef class ArcEager(TransitionSystem):
else: else:
is_valid[i] = False is_valid[i] = False
costs[i] = 9000 costs[i] = 9000
if n_gold == 0:
# Check projectivity --- leading cause
if is_nonproj_tree(gold.heads):
raise ValueError(
"Could not find a gold-standard action to supervise the dependency "
"parser.\n"
"Likely cause: the tree is non-projective (i.e. it has crossing "
"arcs -- see spacy/syntax/nonproj.pyx for definitions)\n"
"The ArcEager transition system only supports projective trees.\n"
"To learn non-projective representations, transform the data "
"before training and after parsing. Either pass make_projective=True "
"to the GoldParse class, or use PseudoProjectivity.preprocess_training_data")
else:
raise ValueError(
"Could not find a gold-standard action to supervise the dependency "
"parser.\n"
"The GoldParse was projective.")
assert n_gold >= 1 assert n_gold >= 1