GH-3536: fix state dict key mismatch for embeddings in TextPairRegres…

…sor. this was causing a bug where the model failed to load from the output state dict

flair/models/pairwise_regression_model.py

@@ -1,6 +1,5 @@
-import typing
 from pathlib import Path
-from typing import Any, List, Optional, Tuple, Union
+from typing import Any, Dict, Iterable, List, Optional, Tuple, Union
 
 import torch
 from torch import nn
@@ -91,7 +90,7 @@ def label_type(self):
 
  def get_used_tokens(
  self, corpus: Corpus, context_length: int = 0, respect_document_boundaries: bool = True
- ) -> typing.Iterable[List[str]]:
+ ) -> Iterable[List[str]]:
  for sentence_pair in _iter_dataset(corpus.get_all_sentences()):
  yield [t.text for t in sentence_pair.first]
  yield [t.text for t in sentence_pair.first.left_context(context_length, respect_document_boundaries)]
@@ -204,10 +203,16 @@ def _get_state_dict(self):
  return model_state
 
  @classmethod
- def _init_model_with_state_dict(cls, state, **kwargs):
- # add DefaultClassifier arguments
+ def _init_model_with_state_dict(cls, state: Dict[str, Any], **kwargs):
+ """Initializes a TextPairRegressor model from a state dictionary (exported by _get_state_dict).
+
+ Requires keys 'state_dict', 'document_embeddings', and 'label_type' in the state dictionary.
+ """
+ if "document_embeddings" in state:
+ state["embeddings"] = state.pop("document_embeddings") # need to rename this parameter
+ # add Model arguments
  for arg in [
- "document_embeddings",
+ "embeddings",
  "label_type",
  "embed_separately",
  "dropout",