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GH-3676: make sentencepiece a lazy import for BytePairEmbeddings #3696

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GH-3676: make sentencepiece a lazy import for BytePairEmbeddings #3696

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2 changes: 1 addition & 1 deletion flair/embeddings/token.py
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Original file line number Diff line number Diff line change
Expand Up @@ -9,7 +9,6 @@
import numpy as np
import torch
from deprecated.sphinx import deprecated
from sentencepiece import SentencePieceProcessor
from torch import nn

import flair
Expand Down Expand Up @@ -1389,6 +1388,7 @@ def __init__(
cache_dir = flair.cache_root / "embeddings"

if model_file_path is not None and embedding_file_path is None:
(SentencePieceProcessor,) = lazy_import("word-embeddings", "sentencepiece", "SentencePieceProcessor")
self.spm = SentencePieceProcessor()
self.spm.Load(str(model_file_path))
vectors = np.zeros((self.spm.vocab_size() + 1, dim))
Expand Down