Add Writer, Banana, Modal, StochasticAI (#1270)

Add LLM wrappers and examples for Banana, Writer, Modal, Stochastic AI

Added rigid json format for Banana and Modal

tests/integration_tests/llms/test_banana.py

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+"""Test BananaDev API wrapper."""
+
+from langchain.llms.bananadev import Banana
+
+
+def test_banana_call() -> None:
+    """Test valid call to BananaDev."""
+    llm = Banana()
+    output = llm("Say foo:")
+    assert isinstance(output, str)

tests/integration_tests/llms/test_modal.py

@@ -0,0 +1,10 @@
+"""Test Modal API wrapper."""
+
+from langchain.llms.modal import Modal
+
+
+def test_modal_call() -> None:
+    """Test valid call to Modal."""
+    llm = Modal()
+    output = llm("Say foo:")
+    assert isinstance(output, str)

tests/integration_tests/llms/test_stochasticai.py

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+"""Test StochasticAI API wrapper."""
+
+from langchain.llms.stochasticai import StochasticAI
+
+
+def test_stochasticai_call() -> None:
+    """Test valid call to StochasticAI."""
+    llm = StochasticAI()
+    output = llm("Say foo:")
+    assert isinstance(output, str)

tests/integration_tests/llms/test_writer.py

@@ -0,0 +1,10 @@
+"""Test Writer API wrapper."""
+
+from langchain.llms.writer import Writer
+
+
+def test_writer_call() -> None:
+    """Test valid call to Writer."""
+    llm = Writer()
+    output = llm("Say foo:")
+    assert isinstance(output, str)