partners[azure]: fix having openai_api_base set for other packages (#22068)

This fix is for #21726. When having other packages installed that
require the `openai_api_base` environment variable, users are not able
to instantiate the AzureChatModels or AzureEmbeddings.

This PR adds a new value `ignore_openai_api_base` which is a bool. When
set to True, it sets `openai_api_base` to `None`

Two new tests were added for the `test_azure` and a new file
`test_azure_embeddings`

A different approach may be better for this. If you can think of better
logic, let me know and I can adjust it.

---------

Co-authored-by: Erick Friis <erick@langchain.dev>

libs/partners/openai/langchain_openai/chat_models/azure.py

@@ -1,4 +1,5 @@
 """Azure OpenAI chat wrapper."""
+
 from __future__ import annotations
 
 import logging
@@ -548,8 +549,10 @@ class AzureChatOpenAI(BaseChatOpenAI):
         values["openai_api_key"] = (
             convert_to_secret_str(openai_api_key) if openai_api_key else None
         )
-        values["openai_api_base"] = values["openai_api_base"] or os.getenv(
-            "OPENAI_API_BASE"
+        values["openai_api_base"] = (
+            values["openai_api_base"]
+            if "openai_api_base" in values
+            else os.getenv("OPENAI_API_BASE")
         )
         values["openai_api_version"] = values["openai_api_version"] or os.getenv(
             "OPENAI_API_VERSION"
@@ -601,12 +604,16 @@ class AzureChatOpenAI(BaseChatOpenAI):
             "api_version": values["openai_api_version"],
             "azure_endpoint": values["azure_endpoint"],
             "azure_deployment": values["deployment_name"],
-            "api_key": values["openai_api_key"].get_secret_value()
-            if values["openai_api_key"]
-            else None,
-            "azure_ad_token": values["azure_ad_token"].get_secret_value()
-            if values["azure_ad_token"]
-            else None,
+            "api_key": (
+                values["openai_api_key"].get_secret_value()
+                if values["openai_api_key"]
+                else None
+            ),
+            "azure_ad_token": (
+                values["azure_ad_token"].get_secret_value()
+                if values["azure_ad_token"]
+                else None
+            ),
             "azure_ad_token_provider": values["azure_ad_token_provider"],
             "organization": values["openai_organization"],
             "base_url": values["openai_api_base"],

libs/partners/openai/langchain_openai/embeddings/azure.py

@@ -75,8 +75,10 @@ class AzureOpenAIEmbeddings(OpenAIEmbeddings):
         values["openai_api_key"] = (
             convert_to_secret_str(openai_api_key) if openai_api_key else None
         )
-        values["openai_api_base"] = values["openai_api_base"] or os.getenv(
-            "OPENAI_API_BASE"
+        values["openai_api_base"] = (
+            values["openai_api_base"]
+            if "openai_api_base" in values
+            else os.getenv("OPENAI_API_BASE")
         )
         values["openai_api_version"] = values["openai_api_version"] or os.getenv(
             "OPENAI_API_VERSION", default="2023-05-15"

libs/partners/openai/tests/unit_tests/chat_models/test_azure.py

@@ -1,5 +1,7 @@
 """Test Azure OpenAI Chat API wrapper."""
 
+import os
+
 from langchain_openai import AzureChatOpenAI
 
 
@@ -32,3 +34,25 @@ def test_initialize_more() -> None:
     ls_params = llm._get_ls_params()
     assert ls_params["ls_provider"] == "azure"
     assert ls_params["ls_model_name"] == "35-turbo-dev"
+
+
+def test_initialize_azure_openai_with_openai_api_base_set() -> None:
+    os.environ["OPENAI_API_BASE"] = "https://api.openai.com"
+    llm = AzureChatOpenAI(
+        api_key="xyz",
+        azure_endpoint="my-base-url",
+        azure_deployment="35-turbo-dev",
+        openai_api_version="2023-05-15",
+        temperature=0,
+        openai_api_base=None,
+    )
+    assert llm.openai_api_key is not None
+    assert llm.openai_api_key.get_secret_value() == "xyz"
+    assert llm.azure_endpoint == "my-base-url"
+    assert llm.deployment_name == "35-turbo-dev"
+    assert llm.openai_api_version == "2023-05-15"
+    assert llm.temperature == 0
+
+    ls_params = llm._get_ls_params()
+    assert ls_params["ls_provider"] == "azure"
+    assert ls_params["ls_model_name"] == "35-turbo-dev"

libs/partners/openai/tests/unit_tests/embeddings/test_azure_embeddings.py

@@ -0,0 +1,27 @@
+import os
+
+from langchain_openai import AzureOpenAIEmbeddings
+
+
+def test_initialize_azure_openai() -> None:
+    embeddings = AzureOpenAIEmbeddings(
+        model="text-embedding-large",
+        api_key="xyz",
+        azure_endpoint="my-base-url",
+        azure_deployment="35-turbo-dev",
+        openai_api_version="2023-05-15",
+    )
+    assert embeddings.model == "text-embedding-large"
+
+
+def test_intialize_azure_openai_with_base_set() -> None:
+    os.environ["OPENAI_API_BASE"] = "https://api.openai.com"
+    embeddings = AzureOpenAIEmbeddings(
+        model="text-embedding-large",
+        api_key="xyz",
+        azure_endpoint="my-base-url",
+        azure_deployment="35-turbo-dev",
+        openai_api_version="2023-05-15",
+        openai_api_base=None,
+    )
+    assert embeddings.model == "text-embedding-large"