{
 "cells": [
  {
   "cell_type": "markdown",
   "id": "10ae2b14",
   "metadata": {},
   "source": [
    "# Sentence Embeddings with Hugging Face Transformers, Sentence Transformers and Amazon SageMaker - Custom Inference for creating document embeddings with Hugging Face's Transformers\n"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "5a1644f1",
   "metadata": {},
   "source": [
    "Welcome to this getting started guide. We will use the Hugging Face Inference DLCs and Amazon SageMaker Python SDK to create a [real-time inference endpoint](https://docs.aws.amazon.com/sagemaker/latest/dg/realtime-endpoints.html) running a Sentence Transformers for document embeddings. Currently, the [SageMaker Hugging Face Inference Toolkit](https://github.com/aws/sagemaker-huggingface-inference-toolkit) supports the [pipeline feature](https://huggingface.co/transformers/main_classes/pipelines.html) from Transformers for zero-code deployment. This means you can run compatible Hugging Face Transformer models without providing pre- & post-processing code. Therefore we only need to provide an environment variable `HF_TASK` and `HF_MODEL_ID` when creating our endpoint and the Inference Toolkit will take care of it. This is a great feature if you are working with existing [pipelines](https://huggingface.co/transformers/main_classes/pipelines.html).\n",
    "\n",
    "If you want to run other tasks, such as creating document embeddings, you can the pre- and post-processing code yourself, via an `inference.py` script. The Hugging Face Inference Toolkit allows the user to override the default methods of the `HuggingFaceHandlerService`.\n",
    "\n",
    "The custom module can override the following methods:\n",
    "\n",
    "- `model_fn(model_dir)` overrides the default method for loading a model. The return value `model` will be used in the`predict_fn` for predictions.\n",
    "  -  `model_dir` is the the path to your unzipped `model.tar.gz`.\n",
    "- `input_fn(input_data, content_type)` overrides the default method for pre-processing. The return value `data` will be used in `predict_fn` for predictions. The inputs are:\n",
    "    - `input_data` is the raw body of your request.\n",
    "    - `content_type` is the content type from the request header.\n",
    "- `predict_fn(processed_data, model)` overrides the default method for predictions. The return value `predictions` will be used in `output_fn`.\n",
    "  - `model` returned value from `model_fn` methond\n",
    "  - `processed_data` returned value from `input_fn` method\n",
    "- `output_fn(prediction, accept)` overrides the default method for post-processing. The return value `result` will be the response to your request (e.g.`JSON`). The inputs are:\n",
    "    - `predictions` is the result from `predict_fn`.\n",
    "    - `accept` is the return accept type from the HTTP Request, e.g. `application/json`.\n",
    "\n",
    "In this example are we going to use Sentence Transformers to create sentence embeddings using a mean pooling layer on the raw representation.\n",
    "\n",
    "*NOTE: You can run this demo in Sagemaker Studio, your local machine, or Sagemaker Notebook Instances*"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "e1e723ab",
   "metadata": {},
   "source": [
    "## Development Environment and Permissions\n",
    "\n",
    "### Installation \n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "69c59d90",
   "metadata": {},
   "outputs": [],
   "source": [
    "%pip install sagemaker --upgrade"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "ce0ef431",
   "metadata": {},
   "source": [
    "Install `git` and `git-lfs`"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "96d8dfea",
   "metadata": {},
   "outputs": [],
   "source": [
    "# For notebook instances (Amazon Linux)\n",
    "!sudo yum update -y \n",
    "!curl -s https://packagecloud.io/install/repositories/github/git-lfs/script.rpm.sh | sudo bash\n",
    "!sudo yum install git-lfs git -y\n",
    "# For other environments (Ubuntu)\n",
    "!sudo apt-get update -y \n",
    "!curl -s https://packagecloud.io/install/repositories/github/git-lfs/script.deb.sh | sudo bash\n",
    "!sudo apt-get install git-lfs git -y"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "9e4386d9",
   "metadata": {},
   "source": [
    "### Permissions\n",
    "\n",
    "_If you are going to use Sagemaker in a local environment (not SageMaker Studio or Notebook Instances). You need access to an IAM Role with the required permissions for Sagemaker. You can find [here](https://docs.aws.amazon.com/sagemaker/latest/dg/sagemaker-roles.html) more about it._"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "id": "1c22e8d5",
   "metadata": {},
   "outputs": [
    {
     "name": "stderr",
     "output_type": "stream",
     "text": [
      "Couldn't call 'get_role' to get Role ARN from role name philippschmid to get Role path.\n"
     ]
    },
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "sagemaker role arn: arn:aws:iam::558105141721:role/sagemaker_execution_role\n",
      "sagemaker bucket: sagemaker-us-east-1-558105141721\n",
      "sagemaker session region: us-east-1\n"
     ]
    }
   ],
   "source": [
    "import sagemaker\n",
    "import boto3\n",
    "sess = sagemaker.Session()\n",
    "# sagemaker session bucket -> used for uploading data, models and logs\n",
    "# sagemaker will automatically create this bucket if it not exists\n",
    "sagemaker_session_bucket=None\n",
    "if sagemaker_session_bucket is None and sess is not None:\n",
    "    # set to default bucket if a bucket name is not given\n",
    "    sagemaker_session_bucket = sess.default_bucket()\n",
    "\n",
    "try:\n",
    "    role = sagemaker.get_execution_role()\n",
    "except ValueError:\n",
    "    iam = boto3.client('iam')\n",
    "    role = iam.get_role(RoleName='sagemaker_execution_role')['Role']['Arn']\n",
    "\n",
    "sess = sagemaker.Session(default_bucket=sagemaker_session_bucket)\n",
    "\n",
    "print(f\"sagemaker role arn: {role}\")\n",
    "print(f\"sagemaker bucket: {sess.default_bucket()}\")\n",
    "print(f\"sagemaker session region: {sess.boto_region_name}\")"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "0b0fc22f",
   "metadata": {},
   "source": [
    "## Create custom an `inference.py` script\n",
    "\n",
    "To use the custom inference script, you need to create an `inference.py` script. In our example, we are going to overwrite the `model_fn` to load our sentence transformer correctly and the `predict_fn` to apply mean pooling.\n",
    "\n",
    "We are going to use the [sentence-transformers/all-MiniLM-L6-v2](https://huggingface.co/sentence-transformers/all-MiniLM-L6-v2) model. It maps sentences & paragraphs to a 384 dimensional dense vector space and can be used for tasks like clustering or semantic search."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 17,
   "id": "b4246c06",
   "metadata": {},
   "outputs": [],
   "source": [
    "!mkdir code"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 38,
   "id": "3ce41529",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Overwriting code/inference.py\n"
     ]
    }
   ],
   "source": [
    "%%writefile code/inference.py\n",
    "\n",
    "from transformers import AutoTokenizer, AutoModel\n",
    "import torch\n",
    "import torch.nn.functional as F\n",
    "\n",
    "# Helper: Mean Pooling - Take attention mask into account for correct averaging\n",
    "def mean_pooling(model_output, attention_mask):\n",
    "    token_embeddings = model_output[0] #First element of model_output contains all token embeddings\n",
    "    input_mask_expanded = attention_mask.unsqueeze(-1).expand(token_embeddings.size()).float()\n",
    "    return torch.sum(token_embeddings * input_mask_expanded, 1) / torch.clamp(input_mask_expanded.sum(1), min=1e-9)\n",
    "\n",
    "\n",
    "def model_fn(model_dir):\n",
    "  # Load model from HuggingFace Hub\n",
    "  tokenizer = AutoTokenizer.from_pretrained(model_dir)\n",
    "  model = AutoModel.from_pretrained(model_dir)\n",
    "  return model, tokenizer\n",
    "\n",
    "def predict_fn(data, model_and_tokenizer):\n",
    "    # destruct model and tokenizer\n",
    "    model, tokenizer = model_and_tokenizer\n",
    "    \n",
    "    # Tokenize sentences\n",
    "    sentences = data.pop(\"inputs\", data)\n",
    "    encoded_input = tokenizer(sentences, padding=True, truncation=True, return_tensors='pt')\n",
    "\n",
    "    # Compute token embeddings\n",
    "    with torch.no_grad():\n",
    "        model_output = model(**encoded_input)\n",
    "\n",
    "    # Perform pooling\n",
    "    sentence_embeddings = mean_pooling(model_output, encoded_input['attention_mask'])\n",
    "\n",
    "    # Normalize embeddings\n",
    "    sentence_embeddings = F.normalize(sentence_embeddings, p=2, dim=1)\n",
    "    \n",
    "    # return dictonary, which will be json serializable\n",
    "    return {\"vectors\": sentence_embeddings[0].tolist()}"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "144d8ccb",
   "metadata": {},
   "source": [
    "## Create `model.tar.gz` with inference script and model \n",
    "\n",
    "To use our `inference.py` we need to bundle it into a `model.tar.gz` archive with all our model-artifcats, e.g. `pytorch_model.bin`. The `inference.py` script will be placed into a `code/` folder. We will use `git` and `git-lfs` to easily download our model from hf.co/models and upload it to Amazon S3 so we can use it when creating our SageMaker endpoint."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 39,
   "id": "952983b5",
   "metadata": {},
   "outputs": [],
   "source": [
    "repository = \"sentence-transformers/all-MiniLM-L6-v2\"\n",
    "model_id=repository.split(\"/\")[-1]\n",
    "s3_location=f\"s3://{sess.default_bucket()}/custom_inference/{model_id}/model.tar.gz\""
   ]
  },
  {
   "cell_type": "markdown",
   "id": "374ff630",
   "metadata": {},
   "source": [
    "1. Download the model from hf.co/models with `git clone`."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 40,
   "id": "b8452981",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Updated git hooks.\n",
      "Git LFS initialized.\n",
      "Cloning into 'all-MiniLM-L6-v2'...\n",
      "remote: Enumerating objects: 25, done.\u001b[K\n",
      "remote: Counting objects: 100% (25/25), done.\u001b[K\n",
      "remote: Compressing objects: 100% (23/23), done.\u001b[K\n",
      "remote: Total 25 (delta 3), reused 0 (delta 0)\u001b[K.00 KiB/s\n",
      "Unpacking objects: 100% (25/25), 308.60 KiB | 454.00 KiB/s, done.\n"
     ]
    }
   ],
   "source": [
    "!git lfs install\n",
    "!git clone https://huggingface.co/$repository"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "09a6f330",
   "metadata": {},
   "source": [
    "2. copy `inference.py`  into the `code/` directory of the model directory."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 41,
   "id": "6146af09",
   "metadata": {},
   "outputs": [],
   "source": [
    "!cp -r code/ $model_id/code/"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "04e1395a",
   "metadata": {},
   "source": [
    "3. Create a `model.tar.gz` archive with all the model artifacts and the `inference.py` script.\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 42,
   "id": "e65fd56e",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "/Users/philipp/.Trash/all-MiniLM-L6-v2/all-MiniLM-L6-v2\n",
      "a 1_Pooling\n",
      "a 1_Pooling/config.json\n",
      "a README.md\n",
      "a code\n",
      "a code/inference.py\n",
      "a config.json\n",
      "a config_sentence_transformers.json\n",
      "a data_config.json\n",
      "a modules.json\n",
      "a pytorch_model.bin\n",
      "a sentence_bert_config.json\n",
      "a special_tokens_map.json\n",
      "a tokenizer.json\n",
      "a tokenizer_config.json\n",
      "a train_script.py\n",
      "a vocab.txt\n"
     ]
    }
   ],
   "source": [
    "%cd $model_id\n",
    "!tar zcvf model.tar.gz *"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "1c858560",
   "metadata": {},
   "source": [
    "4. Upload the `model.tar.gz` to Amazon S3:\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 43,
   "id": "c581bc40",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "upload: ./model.tar.gz to s3://sagemaker-us-east-1-558105141721/custom_inference/all-MiniLM-L6-v2/model.tar.gz\n"
     ]
    }
   ],
   "source": [
    "!aws s3 cp model.tar.gz $s3_location\n"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "0a146346",
   "metadata": {},
   "source": [
    "## Create custom `HuggingfaceModel` \n",
    "\n",
    "After we have created and uploaded our `model.tar.gz` archive to Amazon S3. Can we create a custom `HuggingfaceModel` class. This class will be used to create and deploy our SageMaker endpoint."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 44,
   "id": "1c5ba990",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "-----------!"
     ]
    }
   ],
   "source": [
    "from sagemaker.huggingface.model import HuggingFaceModel\n",
    "\n",
    "\n",
    "# create Hugging Face Model Class\n",
    "huggingface_model = HuggingFaceModel(\n",
    "   model_data=s3_location,       # path to your model and script\n",
    "   role=role,                    # iam role with permissions to create an Endpoint\n",
    "   transformers_version=\"4.26\",  # transformers version used\n",
    "   pytorch_version=\"1.13\",        # pytorch version used\n",
    "   py_version='py39',            # python version used\n",
    ")\n",
    "\n",
    "# deploy the endpoint endpoint\n",
    "predictor = huggingface_model.deploy(\n",
    "    initial_instance_count=1,\n",
    "    instance_type=\"ml.g4dn.xlarge\"\n",
    "    )"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "b6b3812f",
   "metadata": {},
   "source": [
    "## Request Inference Endpoint using the `HuggingfacePredictor`\n",
    "\n",
    "The `.deploy()` returns an `HuggingFacePredictor` object which can be used to request inference."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 45,
   "id": "51c5366b",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "{'vectors': [0.005078191868960857, -0.0036594511475414038, 0.016988741233944893, -0.0015786211006343365, 0.030203675851225853, 0.09331899881362915, -0.0235157310962677, 0.011795195750892162, 0.03421774506568909, -0.027907833456993103, -0.03260169178247452, 0.0679800882935524, 0.015223750844597816, 0.025948498398065567, -0.07854384928941727, -0.0023915462661534548, 0.10089637339115143, 0.0014981384156271815, -0.017778029665350914, 0.005812637507915497, 0.02445339597761631, -0.0710371807217598, 0.04755859822034836, 0.026360979303717613, -0.05716250091791153, -0.0940014198422432, 0.047949012368917465, 0.008600219152867794, 0.03297032043337822, -0.06984368711709976, -0.0552142858505249, -0.03234352916479111, -0.0003443364112172276, 0.012479404918849468, -0.07419367134571075, 0.08545409888029099, 0.019597113132476807, 0.005851477384567261, -0.08256848156452179, 0.010150186717510223, 0.028275227174162865, -0.0016121627995744348, 0.04174523428082466, -0.009756717830896378, 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     ]
    }
   ],
   "source": [
    "data = {\n",
    "  \"inputs\": \"the mesmerizing performances of the leads keep the film grounded and keep the audience riveted .\",\n",
    "}\n",
    "\n",
    "res = predictor.predict(data=data)\n",
    "print(res)\n"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "cb10007d",
   "metadata": {},
   "source": [
    "### Delete model and endpoint\n",
    "\n",
    "To clean up, we can delete the model and endpoint."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 46,
   "id": "1e6fb7b8",
   "metadata": {},
   "outputs": [],
   "source": [
    "predictor.delete_model()\n",
    "predictor.delete_endpoint()"
   ]
  }
 ],
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  "interpreter": {
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  "kernelspec": {
   "display_name": "conda_pytorch_p39",
   "language": "python",
   "name": "conda_pytorch_p39"
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  "language_info": {
   "codemirror_mode": {
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