def ensure_proper_language_model(nlp):
# type: (Optional[Language]) -> None
"""Checks if the spacy language model is properly loaded. Raises an exception if the model is invalid."""
if nlp is None:
raise Exception("Failed to load spacy language model. Loading the model returned 'None'.")
if nlp.path is None:
# Spacy sets the path to `None` if it did not load the model from disk.
# In this case `nlp` is an unusable stub.
raise Exception("Failed to load spacy language model for lang '{}'. ".format(nlp.lang) +
"Make sure you have downloaded the correct model (https://spacy.io/docs/usage/).")
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