import itertools

import numpy
import pytest
from numpy.testing import assert_equal
from thinc.api import Adam, fix_random_seed

from spacy import registry, util
from spacy.attrs import DEP, NORM
from spacy.lang.en import English
from spacy.pipeline import DependencyParser
from spacy.pipeline.dep_parser import DEFAULT_PARSER_MODEL
from spacy.pipeline.tok2vec import DEFAULT_TOK2VEC_MODEL
from spacy.tokens import Doc
from spacy.training import Example
from spacy.vocab import Vocab

from ..util import apply_transition_sequence, make_tempdir

TRAIN_DATA = [
    (
        "They trade mortgage-backed securities.",
        {
            "heads": [1, 1, 4, 4, 5, 1, 1],
            "deps": ["nsubj", "ROOT", "compound", "punct", "nmod", "dobj", "punct"],
        },
    ),
    (
        "I like London and Berlin.",
        {
            "heads": [1, 1, 1, 2, 2, 1],
            "deps": ["nsubj", "ROOT", "dobj", "cc", "conj", "punct"],
        },
    ),
]


CONFLICTING_DATA = [
    (
        "I like London and Berlin.",
        {
            "heads": [1, 1, 1, 2, 2, 1],
            "deps": ["nsubj", "ROOT", "dobj", "cc", "conj", "punct"],
        },
    ),
    (
        "I like London and Berlin.",
        {
            "heads": [0, 0, 0, 0, 0, 0],
            "deps": ["ROOT", "nsubj", "nsubj", "cc", "conj", "punct"],
        },
    ),
]

PARTIAL_DATA = [
    (
        "I like London.",
        {
            "heads": [1, 1, 1, None],
            "deps": ["nsubj", "ROOT", "dobj", None],
        },
    ),
]

PARSERS = ["parser"]  # TODO: Test beam_parser when ready

eps = 0.1


@pytest.fixture
def vocab():
    return Vocab(lex_attr_getters={NORM: lambda s: s})


@pytest.fixture
def parser(vocab):
    vocab.strings.add("ROOT")
    cfg = {"model": DEFAULT_PARSER_MODEL}
    model = registry.resolve(cfg, validate=True)["model"]
    parser = DependencyParser(vocab, model)
    parser.cfg["token_vector_width"] = 4
    parser.cfg["hidden_width"] = 32
    # parser.add_label('right')
    parser.add_label("left")
    parser.initialize(lambda: [_parser_example(parser)])
    sgd = Adam(0.001)

    for i in range(10):
        losses = {}
        doc = Doc(vocab, words=["a", "b", "c", "d"])
        example = Example.from_dict(
            doc, {"heads": [1, 1, 3, 3], "deps": ["left", "ROOT", "left", "ROOT"]}
        )
        parser.update([example], sgd=sgd, losses=losses)
    return parser


def _parser_example(parser):
    doc = Doc(parser.vocab, words=["a", "b", "c", "d"])
    gold = {"heads": [1, 1, 3, 3], "deps": ["right", "ROOT", "left", "ROOT"]}
    return Example.from_dict(doc, gold)


@pytest.mark.issue(2772)
def test_issue2772(en_vocab):
    """Test that deprojectivization doesn't mess up sentence boundaries."""
    # fmt: off
    words = ["When", "we", "write", "or", "communicate", "virtually", ",", "we", "can", "hide", "our", "true", "feelings", "."]
    # fmt: on
    # A tree with a non-projective (i.e. crossing) arc
    # The arcs (0, 4) and (2, 9) cross.
    heads = [4, 2, 9, 2, 2, 4, 9, 9, 9, 9, 12, 12, 9, 9]
    deps = ["dep"] * len(heads)
    doc = Doc(en_vocab, words=words, heads=heads, deps=deps)
    assert doc[1].is_sent_start is False


@pytest.mark.issue(3830)
def test_issue3830_no_subtok():
    """Test that the parser doesn't have subtok label if not learn_tokens"""
    config = {
        "learn_tokens": False,
    }
    model = registry.resolve({"model": DEFAULT_PARSER_MODEL}, validate=True)["model"]
    parser = DependencyParser(Vocab(), model, **config)
    parser.add_label("nsubj")
    assert "subtok" not in parser.labels
    parser.initialize(lambda: [_parser_example(parser)])
    assert "subtok" not in parser.labels


@pytest.mark.issue(3830)
def test_issue3830_with_subtok():
    """Test that the parser does have subtok label if learn_tokens=True."""
    config = {
        "learn_tokens": True,
    }
    model = registry.resolve({"model": DEFAULT_PARSER_MODEL}, validate=True)["model"]
    parser = DependencyParser(Vocab(), model, **config)
    parser.add_label("nsubj")
    assert "subtok" not in parser.labels
    parser.initialize(lambda: [_parser_example(parser)])
    assert "subtok" in parser.labels


@pytest.mark.issue(7716)
@pytest.mark.xfail(reason="Not fixed yet")
def test_partial_annotation(parser):
    doc = Doc(parser.vocab, words=["a", "b", "c", "d"])
    doc[2].is_sent_start = False
    # Note that if the following line is used, then doc[2].is_sent_start == False
    # doc[3].is_sent_start = False

    doc = parser(doc)
    assert doc[2].is_sent_start == False


def test_parser_root(en_vocab):
    words = ["i", "do", "n't", "have", "other", "assistance"]
    heads = [3, 3, 3, 3, 5, 3]
    deps = ["nsubj", "aux", "neg", "ROOT", "amod", "dobj"]
    doc = Doc(en_vocab, words=words, heads=heads, deps=deps)
    for t in doc:
        assert t.dep != 0, t.text


@pytest.mark.skip(
    reason="The step_through API was removed (but should be brought back)"
)
@pytest.mark.parametrize("words", [["Hello"]])
def test_parser_parse_one_word_sentence(en_vocab, en_parser, words):
    doc = Doc(en_vocab, words=words, heads=[0], deps=["ROOT"])
    assert len(doc) == 1
    with en_parser.step_through(doc) as _:  # noqa: F841
        pass
    assert doc[0].dep != 0


def test_parser_apply_actions(en_vocab, en_parser):
    words = ["I", "ate", "pizza"]
    words2 = ["Eat", "more", "pizza", "!"]
    doc1 = Doc(en_vocab, words=words)
    doc2 = Doc(en_vocab, words=words2)
    docs = [doc1, doc2]

    moves = en_parser.moves
    moves.add_action(0, "")
    moves.add_action(1, "")
    moves.add_action(2, "nsubj")
    moves.add_action(3, "obj")
    moves.add_action(2, "amod")

    actions = [
        numpy.array([0, 0], dtype="i"),
        numpy.array([2, 0], dtype="i"),
        numpy.array([0, 4], dtype="i"),
        numpy.array([3, 3], dtype="i"),
        numpy.array([1, 1], dtype="i"),
        numpy.array([1, 1], dtype="i"),
        numpy.array([0], dtype="i"),
        numpy.array([1], dtype="i"),
    ]

    states = moves.init_batch(docs)
    active_states = states

    for step_actions in actions:
        active_states = moves.apply_actions(active_states, step_actions)

    assert len(active_states) == 0

    for state, doc in zip(states, docs):
        moves.set_annotations(state, doc)

    assert docs[0][0].head.i == 1
    assert docs[0][0].dep_ == "nsubj"
    assert docs[0][1].head.i == 1
    assert docs[0][1].dep_ == "ROOT"
    assert docs[0][2].head.i == 1
    assert docs[0][2].dep_ == "obj"

    assert docs[1][0].head.i == 0
    assert docs[1][0].dep_ == "ROOT"
    assert docs[1][1].head.i == 2
    assert docs[1][1].dep_ == "amod"
    assert docs[1][2].head.i == 0
    assert docs[1][2].dep_ == "obj"


@pytest.mark.skip(
    reason="The step_through API was removed (but should be brought back)"
)
def test_parser_initial(en_vocab, en_parser):
    words = ["I", "ate", "the", "pizza", "with", "anchovies", "."]
    transition = ["L-nsubj", "S", "L-det"]
    doc = Doc(en_vocab, words=words)
    apply_transition_sequence(en_parser, doc, transition)
    assert doc[0].head.i == 1
    assert doc[1].head.i == 1
    assert doc[2].head.i == 3
    assert doc[3].head.i == 3


def test_parser_parse_subtrees(en_vocab, en_parser):
    words = ["The", "four", "wheels", "on", "the", "bus", "turned", "quickly"]
    heads = [2, 2, 6, 2, 5, 3, 6, 6]
    deps = ["dep"] * len(heads)
    doc = Doc(en_vocab, words=words, heads=heads, deps=deps)
    assert len(list(doc[2].lefts)) == 2
    assert len(list(doc[2].rights)) == 1
    assert len(list(doc[2].children)) == 3
    assert len(list(doc[5].lefts)) == 1
    assert len(list(doc[5].rights)) == 0
    assert len(list(doc[5].children)) == 1
    assert len(list(doc[2].subtree)) == 6


def test_parser_merge_pp(en_vocab):
    words = ["A", "phrase", "with", "another", "phrase", "occurs"]
    heads = [1, 5, 1, 4, 2, 5]
    deps = ["det", "nsubj", "prep", "det", "pobj", "ROOT"]
    pos = ["DET", "NOUN", "ADP", "DET", "NOUN", "VERB"]
    doc = Doc(en_vocab, words=words, deps=deps, heads=heads, pos=pos)
    with doc.retokenize() as retokenizer:
        for np in doc.noun_chunks:
            retokenizer.merge(np, attrs={"lemma": np.lemma_})
    assert doc[0].text == "A phrase"
    assert doc[1].text == "with"
    assert doc[2].text == "another phrase"
    assert doc[3].text == "occurs"


@pytest.mark.skip(
    reason="The step_through API was removed (but should be brought back)"
)
def test_parser_arc_eager_finalize_state(en_vocab, en_parser):
    words = ["a", "b", "c", "d", "e"]
    # right branching
    transition = ["R-nsubj", "D", "R-nsubj", "R-nsubj", "D", "R-ROOT"]
    tokens = Doc(en_vocab, words=words)
    apply_transition_sequence(en_parser, tokens, transition)

    assert tokens[0].n_lefts == 0
    assert tokens[0].n_rights == 2
    assert tokens[0].left_edge.i == 0
    assert tokens[0].right_edge.i == 4
    assert tokens[0].head.i == 0

    assert tokens[1].n_lefts == 0
    assert tokens[1].n_rights == 0
    assert tokens[1].left_edge.i == 1
    assert tokens[1].right_edge.i == 1
    assert tokens[1].head.i == 0

    assert tokens[2].n_lefts == 0
    assert tokens[2].n_rights == 2
    assert tokens[2].left_edge.i == 2
    assert tokens[2].right_edge.i == 4
    assert tokens[2].head.i == 0

    assert tokens[3].n_lefts == 0
    assert tokens[3].n_rights == 0
    assert tokens[3].left_edge.i == 3
    assert tokens[3].right_edge.i == 3
    assert tokens[3].head.i == 2

    assert tokens[4].n_lefts == 0
    assert tokens[4].n_rights == 0
    assert tokens[4].left_edge.i == 4
    assert tokens[4].right_edge.i == 4
    assert tokens[4].head.i == 2

    # left branching
    transition = ["S", "S", "S", "L-nsubj", "L-nsubj", "L-nsubj", "L-nsubj"]
    tokens = Doc(en_vocab, words=words)
    apply_transition_sequence(en_parser, tokens, transition)

    assert tokens[0].n_lefts == 0
    assert tokens[0].n_rights == 0
    assert tokens[0].left_edge.i == 0
    assert tokens[0].right_edge.i == 0
    assert tokens[0].head.i == 4

    assert tokens[1].n_lefts == 0
    assert tokens[1].n_rights == 0
    assert tokens[1].left_edge.i == 1
    assert tokens[1].right_edge.i == 1
    assert tokens[1].head.i == 4

    assert tokens[2].n_lefts == 0
    assert tokens[2].n_rights == 0
    assert tokens[2].left_edge.i == 2
    assert tokens[2].right_edge.i == 2
    assert tokens[2].head.i == 4

    assert tokens[3].n_lefts == 0
    assert tokens[3].n_rights == 0
    assert tokens[3].left_edge.i == 3
    assert tokens[3].right_edge.i == 3
    assert tokens[3].head.i == 4

    assert tokens[4].n_lefts == 4
    assert tokens[4].n_rights == 0
    assert tokens[4].left_edge.i == 0
    assert tokens[4].right_edge.i == 4
    assert tokens[4].head.i == 4


def test_parser_set_sent_starts(en_vocab):
    # fmt: off
    words = ['Ein', 'Satz', '.', 'Außerdem', 'ist', 'Zimmer', 'davon', 'überzeugt', ',', 'dass', 'auch', 'epige-', '\n', 'netische', 'Mechanismen', 'eine', 'Rolle', 'spielen', ',', 'also', 'Vorgänge', ',', 'die', '\n', 'sich', 'darauf', 'auswirken', ',', 'welche', 'Gene', 'abgelesen', 'werden', 'und', '\n', 'welche', 'nicht', '.', '\n']
    heads = [1, 1, 1, 30, 4, 4, 7, 4, 7, 17, 14, 14, 11, 14, 17, 16, 17, 6, 17, 20, 11, 20, 26, 22, 26, 26, 20, 26, 29, 31, 31, 25, 31, 32, 17, 4, 4, 36]
    deps = ['nk', 'ROOT', 'punct', 'mo', 'ROOT', 'sb', 'op', 'pd', 'punct', 'cp', 'mo', 'nk', '', 'nk', 'sb', 'nk', 'oa', 're', 'punct', 'mo', 'app', 'punct', 'sb', '', 'oa', 'op', 'rc', 'punct', 'nk', 'sb', 'oc', 're', 'cd', '', 'oa', 'ng', 'punct', '']
    # fmt: on
    doc = Doc(en_vocab, words=words, deps=deps, heads=heads)
    for i in range(len(words)):
        if i == 0 or i == 3:
            assert doc[i].is_sent_start is True
        else:
            assert doc[i].is_sent_start is False
    for sent in doc.sents:
        for token in sent:
            assert token.head in sent


def test_parser_constructor(en_vocab):
    config = {
        "learn_tokens": False,
        "min_action_freq": 30,
        "update_with_oracle_cut_size": 100,
    }
    cfg = {"model": DEFAULT_PARSER_MODEL}
    model = registry.resolve(cfg, validate=True)["model"]
    DependencyParser(en_vocab, model, **config)
    DependencyParser(en_vocab, model)


@pytest.mark.parametrize("pipe_name", PARSERS)
def test_incomplete_data(pipe_name):
    # Test that the parser works with incomplete information
    nlp = English()
    parser = nlp.add_pipe(pipe_name)
    train_examples = []
    for text, annotations in PARTIAL_DATA:
        train_examples.append(Example.from_dict(nlp.make_doc(text), annotations))
        for dep in annotations.get("deps", []):
            if dep is not None:
                parser.add_label(dep)
    optimizer = nlp.initialize(get_examples=lambda: train_examples)
    for i in range(150):
        losses = {}
        nlp.update(train_examples, sgd=optimizer, losses=losses)
    assert losses[pipe_name] < 0.0001

    # test the trained model
    test_text = "I like securities."
    doc = nlp(test_text)
    assert doc[0].dep_ == "nsubj"
    assert doc[2].dep_ == "dobj"
    assert doc[0].head.i == 1
    assert doc[2].head.i == 1


@pytest.mark.parametrize(
    "pipe_name,max_moves", itertools.product(PARSERS, [0, 1, 5, 100])
)
def test_overfitting_IO(pipe_name, max_moves):
    fix_random_seed(0)
    # Simple test to try and quickly overfit the dependency parser (normal or beam)
    nlp = English()
    parser = nlp.add_pipe(pipe_name)
    parser.cfg["update_with_oracle_cut_size"] = max_moves
    train_examples = []
    for text, annotations in TRAIN_DATA:
        train_examples.append(Example.from_dict(nlp.make_doc(text), annotations))
        for dep in annotations.get("deps", []):
            parser.add_label(dep)
    optimizer = nlp.initialize()
    # run overfitting
    for i in range(200):
        losses = {}
        nlp.update(train_examples, sgd=optimizer, losses=losses)
    assert losses[pipe_name] < 0.0001
    # test the trained model
    test_text = "I like securities."
    doc = nlp(test_text)
    assert doc[0].dep_ == "nsubj"
    assert doc[2].dep_ == "dobj"
    assert doc[3].dep_ == "punct"
    assert doc[0].head.i == 1
    assert doc[2].head.i == 1
    assert doc[3].head.i == 1
    # Also test the results are still the same after IO
    with make_tempdir() as tmp_dir:
        nlp.to_disk(tmp_dir)
        nlp2 = util.load_model_from_path(tmp_dir)
        doc2 = nlp2(test_text)
        assert doc2[0].dep_ == "nsubj"
        assert doc2[2].dep_ == "dobj"
        assert doc2[3].dep_ == "punct"
        assert doc2[0].head.i == 1
        assert doc2[2].head.i == 1
        assert doc2[3].head.i == 1

    # Make sure that running pipe twice, or comparing to call, always amounts to the same predictions
    texts = [
        "Just a sentence.",
        "Then one more sentence about London.",
        "Here is another one.",
        "I like London.",
    ]
    batch_deps_1 = [doc.to_array([DEP]) for doc in nlp.pipe(texts)]
    batch_deps_2 = [doc.to_array([DEP]) for doc in nlp.pipe(texts)]
    no_batch_deps = [doc.to_array([DEP]) for doc in [nlp(text) for text in texts]]
    assert_equal(batch_deps_1, batch_deps_2)
    assert_equal(batch_deps_1, no_batch_deps)


def test_is_distillable():
    nlp = English()
    parser = nlp.add_pipe("parser")
    assert parser.is_distillable


@pytest.mark.slow
@pytest.mark.parametrize("max_moves", [0, 1, 5, 100])
def test_distill(max_moves):
    teacher = English()
    teacher_parser = teacher.add_pipe("parser")
    train_examples = []
    for text, annotations in TRAIN_DATA:
        train_examples.append(Example.from_dict(teacher.make_doc(text), annotations))
        for dep in annotations.get("deps", []):
            teacher_parser.add_label(dep)

    optimizer = teacher.initialize(get_examples=lambda: train_examples)

    for i in range(200):
        losses = {}
        teacher.update(train_examples, sgd=optimizer, losses=losses)
    assert losses["parser"] < 0.0001

    student = English()
    student_parser = student.add_pipe("parser")
    student_parser.cfg["update_with_oracle_cut_size"] = max_moves
    student_parser.initialize(
        get_examples=lambda: train_examples, labels=teacher_parser.label_data
    )

    distill_examples = [
        Example.from_dict(teacher.make_doc(t[0]), {}) for t in TRAIN_DATA
    ]

    for i in range(200):
        losses = {}
        student_parser.distill(
            teacher_parser, distill_examples, sgd=optimizer, losses=losses
        )
    assert losses["parser"] < 0.0001

    test_text = "I like securities."
    doc = student(test_text)
    assert doc[0].dep_ == "nsubj"
    assert doc[2].dep_ == "dobj"
    assert doc[3].dep_ == "punct"
    assert doc[0].head.i == 1
    assert doc[2].head.i == 1
    assert doc[3].head.i == 1


# fmt: off
@pytest.mark.slow
@pytest.mark.parametrize("pipe_name", ["parser", "beam_parser"])
@pytest.mark.parametrize(
    "parser_config",
    [
        # TODO: re-enable after we have a spacy-legacy release for v4. See
        # https://github.com/explosion/spacy-legacy/pull/36
        #({"@architectures": "spacy.TransitionBasedParser.v1", "tok2vec": DEFAULT_TOK2VEC_MODEL, "state_type": "parser", "extra_state_tokens": False, "hidden_width": 64, "maxout_pieces": 2, "use_upper": True}),
        ({"@architectures": "spacy.TransitionBasedParser.v2", "tok2vec": DEFAULT_TOK2VEC_MODEL, "state_type": "parser", "extra_state_tokens": False, "hidden_width": 64, "maxout_pieces": 2, "use_upper": True}),
        ({"@architectures": "spacy.TransitionBasedParser.v2", "tok2vec": DEFAULT_TOK2VEC_MODEL, "state_type": "parser", "extra_state_tokens": False, "hidden_width": 64, "maxout_pieces": 2, "use_upper": False}),
        ({"@architectures": "spacy.TransitionBasedParser.v3", "tok2vec": DEFAULT_TOK2VEC_MODEL, "state_type": "parser", "extra_state_tokens": False, "hidden_width": 64, "maxout_pieces": 2}),
    ],
)
# fmt: on
def test_parser_configs(pipe_name, parser_config):
    pipe_config = {"model": parser_config}
    nlp = English()
    parser = nlp.add_pipe(pipe_name, config=pipe_config)
    train_examples = []
    for text, annotations in TRAIN_DATA:
        train_examples.append(Example.from_dict(nlp.make_doc(text), annotations))
        for dep in annotations.get("deps", []):
            parser.add_label(dep)
    optimizer = nlp.initialize()
    for i in range(5):
        losses = {}
        nlp.update(train_examples, sgd=optimizer, losses=losses)


def test_beam_parser_scores():
    # Test that we can get confidence values out of the beam_parser pipe
    beam_width = 16
    beam_density = 0.0001
    nlp = English()
    config = {
        "beam_width": beam_width,
        "beam_density": beam_density,
    }
    parser = nlp.add_pipe("beam_parser", config=config)
    train_examples = []
    for text, annotations in CONFLICTING_DATA:
        train_examples.append(Example.from_dict(nlp.make_doc(text), annotations))
        for dep in annotations.get("deps", []):
            parser.add_label(dep)
    optimizer = nlp.initialize()

    # update a bit with conflicting data
    for i in range(10):
        losses = {}
        nlp.update(train_examples, sgd=optimizer, losses=losses)

    # test the scores from the beam
    test_text = "I like securities."
    doc = nlp.make_doc(test_text)
    docs = [doc]
    beams = parser.predict(docs)
    head_scores, label_scores = parser.scored_parses(beams)

    for j in range(len(doc)):
        for label in parser.labels:
            label_score = label_scores[0][(j, label)]
            assert 0 - eps <= label_score <= 1 + eps
        for i in range(len(doc)):
            head_score = head_scores[0][(j, i)]
            assert 0 - eps <= head_score <= 1 + eps


def test_beam_overfitting_IO():
    # Simple test to try and quickly overfit the Beam dependency parser
    nlp = English()
    beam_width = 16
    beam_density = 0.0001
    config = {
        "beam_width": beam_width,
        "beam_density": beam_density,
    }
    parser = nlp.add_pipe("beam_parser", config=config)
    train_examples = []
    for text, annotations in TRAIN_DATA:
        train_examples.append(Example.from_dict(nlp.make_doc(text), annotations))
        for dep in annotations.get("deps", []):
            parser.add_label(dep)
    optimizer = nlp.initialize()
    # run overfitting
    for i in range(150):
        losses = {}
        nlp.update(train_examples, sgd=optimizer, losses=losses)
    assert losses["beam_parser"] < 0.0001
    # test the scores from the beam
    test_text = "I like securities."
    docs = [nlp.make_doc(test_text)]
    beams = parser.predict(docs)
    head_scores, label_scores = parser.scored_parses(beams)
    # we only processed one document
    head_scores = head_scores[0]
    label_scores = label_scores[0]
    # test label annotations: 0=nsubj, 2=dobj, 3=punct
    assert label_scores[(0, "nsubj")] == pytest.approx(1.0, abs=eps)
    assert label_scores[(0, "dobj")] == pytest.approx(0.0, abs=eps)
    assert label_scores[(0, "punct")] == pytest.approx(0.0, abs=eps)
    assert label_scores[(2, "nsubj")] == pytest.approx(0.0, abs=eps)
    assert label_scores[(2, "dobj")] == pytest.approx(1.0, abs=eps)
    assert label_scores[(2, "punct")] == pytest.approx(0.0, abs=eps)
    assert label_scores[(3, "nsubj")] == pytest.approx(0.0, abs=eps)
    assert label_scores[(3, "dobj")] == pytest.approx(0.0, abs=eps)
    assert label_scores[(3, "punct")] == pytest.approx(1.0, abs=eps)
    # test head annotations: the root is token at index 1
    assert head_scores[(0, 0)] == pytest.approx(0.0, abs=eps)
    assert head_scores[(0, 1)] == pytest.approx(1.0, abs=eps)
    assert head_scores[(0, 2)] == pytest.approx(0.0, abs=eps)
    assert head_scores[(2, 0)] == pytest.approx(0.0, abs=eps)
    assert head_scores[(2, 1)] == pytest.approx(1.0, abs=eps)
    assert head_scores[(2, 2)] == pytest.approx(0.0, abs=eps)
    assert head_scores[(3, 0)] == pytest.approx(0.0, abs=eps)
    assert head_scores[(3, 1)] == pytest.approx(1.0, abs=eps)
    assert head_scores[(3, 2)] == pytest.approx(0.0, abs=eps)

    # Also test the results are still the same after IO
    with make_tempdir() as tmp_dir:
        nlp.to_disk(tmp_dir)
        nlp2 = util.load_model_from_path(tmp_dir)
        docs2 = [nlp2.make_doc(test_text)]
        parser2 = nlp2.get_pipe("beam_parser")
        beams2 = parser2.predict(docs2)
        head_scores2, label_scores2 = parser2.scored_parses(beams2)
        # we only processed one document
        head_scores2 = head_scores2[0]
        label_scores2 = label_scores2[0]
        # check the results again
        assert label_scores2[(0, "nsubj")] == pytest.approx(1.0, abs=eps)
        assert label_scores2[(0, "dobj")] == pytest.approx(0.0, abs=eps)
        assert label_scores2[(0, "punct")] == pytest.approx(0.0, abs=eps)
        assert label_scores2[(2, "nsubj")] == pytest.approx(0.0, abs=eps)
        assert label_scores2[(2, "dobj")] == pytest.approx(1.0, abs=eps)
        assert label_scores2[(2, "punct")] == pytest.approx(0.0, abs=eps)
        assert label_scores2[(3, "nsubj")] == pytest.approx(0.0, abs=eps)
        assert label_scores2[(3, "dobj")] == pytest.approx(0.0, abs=eps)
        assert label_scores2[(3, "punct")] == pytest.approx(1.0, abs=eps)
        assert head_scores2[(0, 0)] == pytest.approx(0.0, abs=eps)
        assert head_scores2[(0, 1)] == pytest.approx(1.0, abs=eps)
        assert head_scores2[(0, 2)] == pytest.approx(0.0, abs=eps)
        assert head_scores2[(2, 0)] == pytest.approx(0.0, abs=eps)
        assert head_scores2[(2, 1)] == pytest.approx(1.0, abs=eps)
        assert head_scores2[(2, 2)] == pytest.approx(0.0, abs=eps)
        assert head_scores2[(3, 0)] == pytest.approx(0.0, abs=eps)
        assert head_scores2[(3, 1)] == pytest.approx(1.0, abs=eps)
        assert head_scores2[(3, 2)] == pytest.approx(0.0, abs=eps)