דף זה תורגם על ידי Cloud Translation API.

מומחי BERT מ- TF-Hub

הצג באתר TensorFlow.org

קולב זה מדגים כיצד:

מודלים ברט טען Hub TensorFlow כי הוכשרו על משימות שונות כולל MNLI, אנשי החוליה, PubMed
השתמש במודל עיבוד מקדים תואם כדי ליצור אסימון של טקסט גולמי ולהמיר אותו למזהים
צור את הפלט המאוחד והרצף ממזהי הקלט האסימון באמצעות המודל הנטען
תסתכל על הדמיון הסמנטי של התפוקות המשולבות של משפטים שונים

הערה: יש להפעיל את הקולאב הזה עם זמן ריצה של GPU

הגדרה ויבוא

pip3 install --quiet tensorflow
pip3 install --quiet tensorflow_text

import seaborn as sns
from sklearn.metrics import pairwise

import tensorflow as tf
import tensorflow_hub as hub
import tensorflow_text as text  # Imports TF ops for preprocessing.

הגדר את הדגם

BERT_MODEL = "https://tfhub.dev/google/experts/bert/wiki_books/2" # @param {type: "string"} ["https://tfhub.dev/google/experts/bert/wiki_books/2", "https://tfhub.dev/google/experts/bert/wiki_books/mnli/2", "https://tfhub.dev/google/experts/bert/wiki_books/qnli/2", "https://tfhub.dev/google/experts/bert/wiki_books/qqp/2", "https://tfhub.dev/google/experts/bert/wiki_books/squad2/2", "https://tfhub.dev/google/experts/bert/wiki_books/sst2/2",  "https://tfhub.dev/google/experts/bert/pubmed/2", "https://tfhub.dev/google/experts/bert/pubmed/squad2/2"]
# Preprocessing must match the model, but all the above use the same.
PREPROCESS_MODEL = "https://tfhub.dev/tensorflow/bert_en_uncased_preprocess/3"

משפטים

בואו ניקח כמה משפטים מויקיפדיה כדי לעבור על המודל

sentences = [
  "Here We Go Then, You And I is a 1999 album by Norwegian pop artist Morten Abel. It was Abel's second CD as a solo artist.",
  "The album went straight to number one on the Norwegian album chart, and sold to double platinum.",
  "Among the singles released from the album were the songs \"Be My Lover\" and \"Hard To Stay Awake\".",
  "Riccardo Zegna is an Italian jazz musician.",
  "Rajko Maksimović is a composer, writer, and music pedagogue.",
  "One of the most significant Serbian composers of our time, Maksimović has been and remains active in creating works for different ensembles.",
  "Ceylon spinach is a common name for several plants and may refer to: Basella alba Talinum fruticosum",
  "A solar eclipse occurs when the Moon passes between Earth and the Sun, thereby totally or partly obscuring the image of the Sun for a viewer on Earth.",
  "A partial solar eclipse occurs in the polar regions of the Earth when the center of the Moon's shadow misses the Earth.",
]

הפעל את הדגם

נטען את מודל ה-BERT מ-TF-Hub, נבצע אסימון למשפטים שלנו באמצעות מודל העיבוד המקדים התואם מ-TF-Hub, ואז נזין את המשפטים הסמליים למודל. כדי לשמור על קולאב מהיר ופשוט, אנו ממליצים לרוץ על GPU.

עבור סוג ריצה שינוי Runtime → לוודא כי GPU נבחרה

preprocess = hub.load(PREPROCESS_MODEL)
bert = hub.load(BERT_MODEL)
inputs = preprocess(sentences)
outputs = bert(inputs)

print("Sentences:")
print(sentences)

print("\nBERT inputs:")
print(inputs)

print("\nPooled embeddings:")
print(outputs["pooled_output"])

print("\nPer token embeddings:")
print(outputs["sequence_output"])

Sentences:
["Here We Go Then, You And I is a 1999 album by Norwegian pop artist Morten Abel. It was Abel's second CD as a solo artist.", 'The album went straight to number one on the Norwegian album chart, and sold to double platinum.', 'Among the singles released from the album were the songs "Be My Lover" and "Hard To Stay Awake".', 'Riccardo Zegna is an Italian jazz musician.', 'Rajko Maksimović is a composer, writer, and music pedagogue.', 'One of the most significant Serbian composers of our time, Maksimović has been and remains active in creating works for different ensembles.', 'Ceylon spinach is a common name for several plants and may refer to: Basella alba Talinum fruticosum', 'A solar eclipse occurs when the Moon passes between Earth and the Sun, thereby totally or partly obscuring the image of the Sun for a viewer on Earth.', "A partial solar eclipse occurs in the polar regions of the Earth when the center of the Moon's shadow misses the Earth."]

BERT inputs:
{'input_word_ids': <tf.Tensor: shape=(9, 128), dtype=int32, numpy=
array([[  101,  2182,  2057, ...,     0,     0,     0],
       [  101,  1996,  2201, ...,     0,     0,     0],
       [  101,  2426,  1996, ...,     0,     0,     0],
       ...,
       [  101, 16447,  6714, ...,     0,     0,     0],
       [  101,  1037,  5943, ...,     0,     0,     0],
       [  101,  1037,  7704, ...,     0,     0,     0]], dtype=int32)>, 'input_type_ids': <tf.Tensor: shape=(9, 128), dtype=int32, numpy=
array([[0, 0, 0, ..., 0, 0, 0],
       [0, 0, 0, ..., 0, 0, 0],
       [0, 0, 0, ..., 0, 0, 0],
       ...,
       [0, 0, 0, ..., 0, 0, 0],
       [0, 0, 0, ..., 0, 0, 0],
       [0, 0, 0, ..., 0, 0, 0]], dtype=int32)>, 'input_mask': <tf.Tensor: shape=(9, 128), dtype=int32, numpy=
array([[1, 1, 1, ..., 0, 0, 0],
       [1, 1, 1, ..., 0, 0, 0],
       [1, 1, 1, ..., 0, 0, 0],
       ...,
       [1, 1, 1, ..., 0, 0, 0],
       [1, 1, 1, ..., 0, 0, 0],
       [1, 1, 1, ..., 0, 0, 0]], dtype=int32)>}

Pooled embeddings:
tf.Tensor(
[[ 0.7975967  -0.48580563  0.49781477 ... -0.3448825   0.3972752
  -0.2063976 ]
 [ 0.57120323 -0.41205275  0.7048914  ... -0.35185075  0.19032307
  -0.4041895 ]
 [-0.699383    0.1586691   0.06569938 ... -0.0623244  -0.81550187
  -0.07923658]
 ...
 [-0.35727128  0.7708977   0.1575658  ...  0.44185698 -0.8644815
   0.04504769]
 [ 0.91077     0.41501352  0.5606345  ... -0.49263868  0.39640594
  -0.05036103]
 [ 0.90502906 -0.15505145  0.72672117 ... -0.34734493  0.5052651
  -0.19543159]], shape=(9, 768), dtype=float32)

Per token embeddings:
tf.Tensor(
[[[ 1.0919718e+00 -5.3055555e-01  5.4639673e-01 ... -3.5962367e-01
    4.2040938e-01 -2.0940571e-01]
  [ 1.0143853e+00  7.8079259e-01  8.5375798e-01 ...  5.5282074e-01
   -1.1245787e+00  5.6027526e-01]
  [ 7.8862888e-01  7.7776514e-02  9.5150793e-01 ... -1.9075295e-01
    5.9206045e-01  6.1910731e-01]
  ...
  [-3.2203159e-01 -4.2521179e-01 -1.2823829e-01 ... -3.9094865e-01
   -7.9097575e-01  4.2236605e-01]
  [-3.1039350e-02  2.3985808e-01 -2.1994556e-01 ... -1.1440065e-01
   -1.2680519e+00 -1.6136172e-01]
  [-4.2063516e-01  5.4972863e-01 -3.2444897e-01 ... -1.8478543e-01
   -1.1342984e+00 -5.8974154e-02]]

 [[ 6.4930701e-01 -4.3808129e-01  8.7695646e-01 ... -3.6755449e-01
    1.9267237e-01 -4.2864648e-01]
  [-1.1248719e+00  2.9931602e-01  1.1799662e+00 ...  4.8729455e-01
    5.3400528e-01  2.2836192e-01]
  [-2.7057338e-01  3.2351881e-02  1.0425698e+00 ...  5.8993816e-01
    1.5367918e+00  5.8425623e-01]
  ...
  [-1.4762508e+00  1.8239072e-01  5.5875197e-02 ... -1.6733241e+00
   -6.7398834e-01 -7.2449744e-01]
  [-1.5138135e+00  5.8184558e-01  1.6141933e-01 ... -1.2640834e+00
   -4.0272138e-01 -9.7197199e-01]
  [-4.7153085e-01  2.2817247e-01  5.2776134e-01 ... -7.5483751e-01
   -9.0903056e-01 -1.6954714e-01]]

 [[-8.6609173e-01  1.6002113e-01  6.5794155e-02 ... -6.2405296e-02
   -1.1432388e+00 -7.9403043e-02]
  [ 7.7117836e-01  7.0804822e-01  1.1350115e-01 ...  7.8831035e-01
   -3.1438148e-01 -9.7487110e-01]
  [-4.4002479e-01 -3.0059522e-01  3.5479453e-01 ...  7.9739094e-02
   -4.7393662e-01 -1.1001848e+00]
  ...
  [-1.0205302e+00  2.6938522e-01 -4.7310370e-01 ... -6.6319543e-01
   -1.4579915e+00 -3.4665459e-01]
  [-9.7003460e-01 -4.5014530e-02 -5.9779549e-01 ... -3.0526626e-01
   -1.2744237e+00 -2.8051588e-01]
  [-7.3144108e-01  1.7699355e-01 -4.6257967e-01 ... -1.6062307e-01
   -1.6346070e+00 -3.2060605e-01]]

 ...

 [[-3.7375441e-01  1.0225365e+00  1.5888955e-01 ...  4.7453594e-01
   -1.3108152e+00  4.5078207e-02]
  [-4.1589144e-01  5.0019276e-01 -4.5844245e-01 ...  4.1482472e-01
   -6.2065876e-01 -7.1555024e-01]
  [-1.2504390e+00  5.0936425e-01 -5.7103634e-01 ...  3.5491806e-01
    2.4368477e-01 -2.0577228e+00]
  ...
  [ 1.3393667e-01  1.1859171e+00 -2.2169831e-01 ... -8.1946820e-01
   -1.6737309e+00 -3.9692628e-01]
  [-3.3662504e-01  1.6556220e+00 -3.7812781e-01 ... -9.6745497e-01
   -1.4801039e+00 -8.3330971e-01]
  [-2.2649485e-01  1.6178465e+00 -6.7044652e-01 ... -4.9078423e-01
   -1.4535751e+00 -7.1707505e-01]]

 [[ 1.5320227e+00  4.4165283e-01  6.3375801e-01 ... -5.3953874e-01
    4.1937760e-01 -5.0403677e-02]
  [ 8.9377600e-01  8.9395344e-01  3.0626178e-02 ...  5.9039176e-02
   -2.0649448e-01 -8.4811246e-01]
  [-1.8557828e-02  1.0479081e+00 -1.3329606e+00 ... -1.3869843e-01
   -3.7879568e-01 -4.9068305e-01]
  ...
  [ 1.4275622e+00  1.0696816e-01 -4.0635362e-02 ... -3.1778324e-02
   -4.1460156e-01  7.0036823e-01]
  [ 1.1286633e+00  1.4547651e-01 -6.1372471e-01 ...  4.7491628e-01
   -3.9852056e-01  4.3124324e-01]
  [ 1.4393284e+00  1.8030575e-01 -4.2854339e-01 ... -2.5022790e-01
   -1.0000544e+00  3.5985461e-01]]

 [[ 1.4993407e+00 -1.5631223e-01  9.2174333e-01 ... -3.6242130e-01
    5.5635113e-01 -1.9797830e-01]
  [ 1.1110539e+00  3.6651433e-01  3.5505858e-01 ... -5.4297698e-01
    1.4471304e-01 -3.1675813e-01]
  [ 2.4048802e-01  3.8115788e-01 -5.9182465e-01 ...  3.7410852e-01
   -5.9829473e-01 -1.0166264e+00]
  ...
  [ 1.0158644e+00  5.0260526e-01  1.0737082e-01 ... -9.5642781e-01
   -4.1039532e-01 -2.6760197e-01]
  [ 1.1848929e+00  6.5479934e-01  1.0166168e-03 ... -8.6154389e-01
   -8.8036627e-02 -3.0636966e-01]
  [ 1.2669108e+00  4.7768092e-01  6.6289604e-03 ... -1.1585802e+00
   -7.0675731e-02 -1.8678737e-01]]], shape=(9, 128, 768), dtype=float32)

דמיון סמנטי

עכשיו בואו נסתכל על pooled_output השיבוצים של המשפטים שלנו ולהשוות כמה הם דומים ברחבי משפטים.

פונקציות עוזר

def plot_similarity(features, labels):
  """Plot a similarity matrix of the embeddings."""
  cos_sim = pairwise.cosine_similarity(features)
  sns.set(font_scale=1.2)
  cbar_kws=dict(use_gridspec=False, location="left")
  g = sns.heatmap(
      cos_sim, xticklabels=labels, yticklabels=labels,
      vmin=0, vmax=1, cmap="Blues", cbar_kws=cbar_kws)
  g.tick_params(labelright=True, labelleft=False)
  g.set_yticklabels(labels, rotation=0)
  g.set_title("Semantic Textual Similarity")

plot_similarity(outputs["pooled_output"], sentences)

png

למד עוד

מצא מודלים ברט יותר על TensorFlow Hub
מחברת זו ממחישה היקש פשוט עם ברט, אתה יכול למצוא מדריך מתקדם יותר בברט כוונון עדין בבית tensorflow.org/official_models/fine_tuning_bert
השתמשנו רק שבב GPU אחד להריץ את המודל, אתה יכול ללמוד עוד על איך מודלי עומס באמצעות tf.distribute ב tensorflow.org/tutorials/distribute/save_and_load