Create token type ids when not provided

[echarlaix]

Fix #2062

[HuggingFaceDocBuilderDev]

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[tomaarsen]

@echarlaix I've tested this with:

from sentence_transformers import SentenceTransformer

model = SentenceTransformer("intfloat/multilingual-e5-small", backend="onnx")

sentences = ["This is an example sentence", "Each sentence is converted"]
embeddings = model.encode(sentences)
print(embeddings.shape)

And it works now. Thanks a bunch.

• Tom Aarsen