Add files

Signed-off-by: Jael Gu <mengjia.gu@zilliz.com>

__init__.py

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+from .openai_embedding import OpenaiEmbeding
+
+def openai(*args, **kwargs):
+    return OpenaiEmbeding(*args, **kwargs)

openai_embedding.py

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+# Copyright 2021 Zilliz. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+
+from openai import Embedding
+from tenacity import retry, stop_after_attempt, wait_random_exponential
+from towhee.operator.base import PyOperator
+
+
+class OpenaiEmbeding(PyOperator):
+    def __init__(self, model_name='text-embedding-ada-002', api_key=None):
+        self._engine = model_name
+        self._api_key = api_key
+
+    @retry(wait=wait_random_exponential(min=1, max=20), stop=stop_after_attempt(6))
+    def _call(self, text):
+        text = text.replace("\n", " ")
+        return Embedding.create(input=[text],
+                                engine=self._engine,
+                                api_key=self._api_key,
+        )["data"][0]["embedding"]
+
+    def __call__(self, text):
+        return self._call(text)
+
+    @staticmethod
+    def supported_model_names():
+        model_list = [
+            'text-embedding-ada-002',
+            'text-similarity-davinci-001',
+            'text-similarity-curie-001',
+            'text-similarity-babbage-001',
+            'text-similarity-ada-001'
+        ]
+        model_list.sort()
+        return model_list
+

requirements.txt

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+openai