[Bug fix] Anthropic, Llama2 and VertexAI LLMs dependencies (#820)

pyproject.toml

@@ -121,6 +121,8 @@ ftfy = { version = "6.1.1", optional = true }
 regex = { version = "2023.8.8", optional = true }
 huggingface_hub = { version = "^0.17.3", optional = true }
 pymilvus = { version="2.3.1", optional = true }
+google-cloud-aiplatform = { version="^1.26.1", optional = true }
+replicate = { version="^0.15.4", optional = true }
 
 [tool.poetry.group.dev.dependencies]
 black = "^23.3.0"
@@ -162,6 +164,8 @@ dataloaders=[
     "unstructured",
     "sentence-transformers",
 ]
+vertexai = ["google-cloud-aiplatform"]
+llama2 = ["replicate"]
 
 [tool.poetry.group.docs.dependencies]