```CODE: 
from sentence_transformers import SentenceTransformer

model = SentenceTransformer("BAAI/bge-m3")

sentences = [
    "That is a happy person",
    "That is a happy dog",
    "That is a very happy person",
    "Today is a sunny day"
]
embeddings = model.encode(sentences)

similarities = model.similarity(embeddings, embeddings)
print(similarities.shape)
# [4, 4]
```

ERROR: 
Traceback (most recent call last):
  File "/tmp/BAAI_bge-m3_0C20eDG.py", line 14, in <module>
    from sentence_transformers import SentenceTransformer
ModuleNotFoundError: No module named 'sentence_transformers'