damccorm commented on code in PR #23554:
URL: https://github.com/apache/beam/pull/23554#discussion_r991276197


##########
website/www/site/content/en/documentation/ml/runinference-metrics.md:
##########
@@ -0,0 +1,103 @@
+---
+title: "RunInference Metrics"
+---
+<!--
+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.
+-->
+
+# RunInference Metrics Example
+
+The main purpose of the example is to demonstrate and explain different 
metrics that are available when using 
[RunInference](https://beam.apache.org/documentation/transforms/python/elementwise/runinference/)
 for doing inference using a machine learning model. We use a pipeline that 
reads a list of sentences, tokeinze the text, uses a Transformer based model 
`distilbert-base-uncased-finetuned-sst-2-english` for classifies the texts into 
two different classes using `RunInference`.
+
+We showcase different RunInference metrics when the pipeline is executed using 
Dataflow Runner on CPU and GPU. The full example code can be found 
[here](https://github.com/apache/beam/tree/master/sdks/python/apache_beam/examples/inference/runinference_metrics/).

Review Comment:
   ```suggestion
   We showcase different RunInference metrics when the pipeline is executed 
using the Dataflow Runner on CPU and GPU. The full example code can be found 
[here](https://github.com/apache/beam/tree/master/sdks/python/apache_beam/examples/inference/runinference_metrics/).
   ```



##########
website/www/site/content/en/documentation/ml/runinference-metrics.md:
##########
@@ -0,0 +1,103 @@
+---
+title: "RunInference Metrics"
+---
+<!--
+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.
+-->
+
+# RunInference Metrics Example
+
+The main purpose of the example is to demonstrate and explain different 
metrics that are available when using 
[RunInference](https://beam.apache.org/documentation/transforms/python/elementwise/runinference/)
 for doing inference using a machine learning model. We use a pipeline that 
reads a list of sentences, tokeinze the text, uses a Transformer based model 
`distilbert-base-uncased-finetuned-sst-2-english` for classifies the texts into 
two different classes using `RunInference`.

Review Comment:
   ```suggestion
   The main purpose of the example is to demonstrate and explain different 
metrics that are available when using the 
[RunInference](https://beam.apache.org/documentation/transforms/python/elementwise/runinference/)
 transform to perform inference using a machine learning model. We use a 
pipeline that reads a list of sentences, tokenizes the text, and uses a 
Transformer based model `distilbert-base-uncased-finetuned-sst-2-english` for 
classifying the texts into two different classes using `RunInference`.
   ```



##########
website/www/site/content/en/documentation/ml/runinference-metrics.md:
##########
@@ -0,0 +1,103 @@
+---
+title: "RunInference Metrics"
+---
+<!--
+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.
+-->
+
+# RunInference Metrics Example
+
+The main purpose of the example is to demonstrate and explain different 
metrics that are available when using 
[RunInference](https://beam.apache.org/documentation/transforms/python/elementwise/runinference/)
 for doing inference using a machine learning model. We use a pipeline that 
reads a list of sentences, tokeinze the text, uses a Transformer based model 
`distilbert-base-uncased-finetuned-sst-2-english` for classifies the texts into 
two different classes using `RunInference`.
+
+We showcase different RunInference metrics when the pipeline is executed using 
Dataflow Runner on CPU and GPU. The full example code can be found 
[here](https://github.com/apache/beam/tree/master/sdks/python/apache_beam/examples/inference/runinference_metrics/).
+
+
+The file structure for entire pipeline is:
+
+    runinference_metrics/
+    ├── pipeline/
+    │   ├── __init__.py
+    │   ├── options.py
+    │   └── transformations.py
+    ├── __init__.py
+    ├── config.py
+    ├── main.py
+    └── setup.py
+
+`pipeline/transormations.py` contains the code for `beam.DoFn` and additional 
functions that are used for pipeline
+
+`pipeline/options.py` contains the pipeline options to configure the Dataflow 
pipeline
+
+`config.py` defines some variables like GCP PROJECT_ID, NUM_WORKERS that are 
used multiple times
+
+`setup.py` defines the packages/requirements for the pipeline to run
+
+`main.py` contains the pipeline code and some additional functions used for 
running the pipeline
+
+
+### How to Run the Pipeline ?
+First, make sure you have installed the required packages. One should have 
access to a Google Cloud Project and then correctly configure the GCP variables 
like `PROJECT_ID`, `REGION`, and others in `config.py`. For using Dataflow with 
GPU, all the necessary setup instructions are mentioned here: 
https://github.com/GoogleCloudPlatform/python-docs-samples/tree/main/dataflow/gpu-examples/pytorch-minimal.
+
+
+1. Dataflow with CPU: `python main.py --mode cloud --device CPU`
+2. Dataflow with GPU: `python main.py --mode cloud --device GPU`
+
+The pipeline can be broken down into few simple steps:
+1. Create a list of texts to use it as an input using `beam.Create`

Review Comment:
   ```suggestion
   1. Create a list of texts to use as an input using `beam.Create`
   ```



##########
website/www/site/content/en/documentation/ml/runinference-metrics.md:
##########
@@ -0,0 +1,103 @@
+---
+title: "RunInference Metrics"
+---
+<!--
+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.
+-->
+
+# RunInference Metrics Example
+
+The main purpose of the example is to demonstrate and explain different 
metrics that are available when using 
[RunInference](https://beam.apache.org/documentation/transforms/python/elementwise/runinference/)
 for doing inference using a machine learning model. We use a pipeline that 
reads a list of sentences, tokeinze the text, uses a Transformer based model 
`distilbert-base-uncased-finetuned-sst-2-english` for classifies the texts into 
two different classes using `RunInference`.
+
+We showcase different RunInference metrics when the pipeline is executed using 
Dataflow Runner on CPU and GPU. The full example code can be found 
[here](https://github.com/apache/beam/tree/master/sdks/python/apache_beam/examples/inference/runinference_metrics/).
+
+
+The file structure for entire pipeline is:
+
+    runinference_metrics/
+    ├── pipeline/
+    │   ├── __init__.py
+    │   ├── options.py
+    │   └── transformations.py
+    ├── __init__.py
+    ├── config.py
+    ├── main.py
+    └── setup.py
+
+`pipeline/transormations.py` contains the code for `beam.DoFn` and additional 
functions that are used for pipeline
+
+`pipeline/options.py` contains the pipeline options to configure the Dataflow 
pipeline
+
+`config.py` defines some variables like GCP PROJECT_ID, NUM_WORKERS that are 
used multiple times
+
+`setup.py` defines the packages/requirements for the pipeline to run
+
+`main.py` contains the pipeline code and some additional functions used for 
running the pipeline
+
+
+### How to Run the Pipeline ?
+First, make sure you have installed the required packages. One should have 
access to a Google Cloud Project and then correctly configure the GCP variables 
like `PROJECT_ID`, `REGION`, and others in `config.py`. For using Dataflow with 
GPU, all the necessary setup instructions are mentioned here: 
https://github.com/GoogleCloudPlatform/python-docs-samples/tree/main/dataflow/gpu-examples/pytorch-minimal.

Review Comment:
   ```suggestion
   First, make sure you have installed the required packages. One should have 
access to a Google Cloud Project and then correctly configure the GCP variables 
like `PROJECT_ID`, `REGION`, and others in `config.py`. To use GPUs, follow the 
setup instructions here: 
https://github.com/GoogleCloudPlatform/python-docs-samples/tree/main/dataflow/gpu-examples/pytorch-minimal.
   
   You can then run your pipeline with the following commands:
   ```



##########
website/www/site/content/en/documentation/ml/runinference-metrics.md:
##########
@@ -0,0 +1,103 @@
+---
+title: "RunInference Metrics"
+---
+<!--
+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.
+-->
+
+# RunInference Metrics Example
+
+The main purpose of the example is to demonstrate and explain different 
metrics that are available when using 
[RunInference](https://beam.apache.org/documentation/transforms/python/elementwise/runinference/)
 for doing inference using a machine learning model. We use a pipeline that 
reads a list of sentences, tokeinze the text, uses a Transformer based model 
`distilbert-base-uncased-finetuned-sst-2-english` for classifies the texts into 
two different classes using `RunInference`.
+
+We showcase different RunInference metrics when the pipeline is executed using 
Dataflow Runner on CPU and GPU. The full example code can be found 
[here](https://github.com/apache/beam/tree/master/sdks/python/apache_beam/examples/inference/runinference_metrics/).
+
+
+The file structure for entire pipeline is:
+
+    runinference_metrics/
+    ├── pipeline/
+    │   ├── __init__.py
+    │   ├── options.py
+    │   └── transformations.py
+    ├── __init__.py
+    ├── config.py
+    ├── main.py
+    └── setup.py
+
+`pipeline/transormations.py` contains the code for `beam.DoFn` and additional 
functions that are used for pipeline
+
+`pipeline/options.py` contains the pipeline options to configure the Dataflow 
pipeline
+
+`config.py` defines some variables like GCP PROJECT_ID, NUM_WORKERS that are 
used multiple times
+
+`setup.py` defines the packages/requirements for the pipeline to run
+
+`main.py` contains the pipeline code and some additional functions used for 
running the pipeline
+
+
+### How to Run the Pipeline ?
+First, make sure you have installed the required packages. One should have 
access to a Google Cloud Project and then correctly configure the GCP variables 
like `PROJECT_ID`, `REGION`, and others in `config.py`. For using Dataflow with 
GPU, all the necessary setup instructions are mentioned here: 
https://github.com/GoogleCloudPlatform/python-docs-samples/tree/main/dataflow/gpu-examples/pytorch-minimal.
+
+
+1. Dataflow with CPU: `python main.py --mode cloud --device CPU`
+2. Dataflow with GPU: `python main.py --mode cloud --device GPU`
+
+The pipeline can be broken down into few simple steps:
+1. Create a list of texts to use it as an input using `beam.Create`
+2. Tokenizing the text
+3. Using RunInference to do inference
+4. Postprocessing the output of RunInference
+
+The code snippet for the pipeline is:
+
+{{< highlight >}}
+  with beam.Pipeline(options=pipeline_options) as pipeline:
+    _ = (
+        pipeline
+        | "Create inputs" >> beam.Create(inputs)
+        | "Tokenize" >> beam.ParDo(Tokenize(cfg.TOKENIZER_NAME))
+        | "Inference" >>
+        RunInference(model_handler=KeyedModelHandler(model_handler))
+        | "Decode Predictions" >> beam.ParDo(PostProcessor()))
+{{< /highlight >}}
+
+
+## RunInference Metrics
+
+As mentioned above, we benchmarked the performance of RunInference using 
Dataflow on both CPU and GPU. These metrics can be seen in the GCP UI and can 
also be printed using
+{{< highlight >}}
+metrics = pipeline.result.metrics().query(beam.metrics.MetricsFilter())
+{{< /highlight >}}
+
+
+A snapshot of different metrics from GCP UI when using Dataflow on GPU:
+
+  
![runinference-GPU-metrics.png](https://drive.google.com/uc?id=1YIwrFXa3XNxzQWAgm_MiEXaSFymcACmV)
+
+Some metrics commonly used for benchmarking are:
+
+* `num_inferences`: represents the total number of elements passed to 
`run_inference()`.
+
+* `inference_batch_latency_micro_secs_MEAN`: represents the average time taken 
to perform the inference across all batches of examples, measured in 
microseconds.
+
+* `inference_request_batch_size_COUNT`: represents the total number of samples 
across all batches of examples (created from `beam.BatchElements`) to be passed 
to run_inference()
+
+* `inference_request_batch_byte_size_MEAN`: represents the average size of all 
elements for all samples in all batches of examples (created from 
`beam.BatchElements`) to be passed to run_inference(). It is measured in bytes.
+
+* `model_byte_size_MEAN`: It represents the average memory consumed to load 
and initialize the model. It is measured in bytes.
+
+* `load_model_latency_milli_secs_MEAN`: represents the average time taken to 
load and initialize the model. It is measured in milliseconds.

Review Comment:
   ```suggestion
   
   * `inference_request_batch_byte_size_MEAN`: represents the average size of 
all elements for all samples in all batches of examples (created from 
`beam.BatchElements`) to be passed to run_inference(). This is measured in 
bytes.
   
   * `model_byte_size_MEAN`: Irepresents the average memory consumed to load 
and initialize the model. This is measured in bytes.
   
   * `load_model_latency_milli_secs_MEAN`: represents the average time taken to 
load and initialize the model. This is measured in milliseconds.
   ```



##########
sdks/python/apache_beam/examples/inference/runinference_metrics/pipeline/transformations.py:
##########
@@ -0,0 +1,93 @@
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You 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.
+#
+
+"""This file contains the transformations and utility functions for
+the pipeline."""
+import apache_beam as beam
+import torch
+from apache_beam.io.filesystems import FileSystems
+from apache_beam.ml.inference.pytorch_inference import 
PytorchModelHandlerKeyedTensor
+from transformers import DistilBertForSequenceClassification
+from transformers import DistilBertTokenizer
+
+
+class CustomPytorchModelHandlerKeyedTensor(PytorchModelHandlerKeyedTensor):
+  """Wrapper around PytorchModelHandlerKeyedTensor to load a model on CPU."""
+  def load_model(self) -> torch.nn.Module:
+    """Loads and initializes a Pytorch model for processing."""
+    model = self._model_class(**self._model_params)
+    model.to(self._device)
+    file = FileSystems.open(self._state_dict_path, "rb")
+    model.load_state_dict(torch.load(file, map_location=self._device))
+    model.eval()
+    return model
+
+
+class HuggingFaceStripBatchingWrapper(DistilBertForSequenceClassification):
+  """Wrapper around HuggingFace model because RunInference requires a batch
+    as a list of dicts instead of a dict of lists. Another workaround

Review Comment:
   Could you please create an issue to support this and then link to the issue 
in the code here? This is something we should probably be able to just 
infer/handle automatically



##########
website/www/site/content/en/documentation/ml/runinference-metrics.md:
##########
@@ -0,0 +1,103 @@
+---
+title: "RunInference Metrics"
+---
+<!--
+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.
+-->
+
+# RunInference Metrics Example
+
+The main purpose of the example is to demonstrate and explain different 
metrics that are available when using 
[RunInference](https://beam.apache.org/documentation/transforms/python/elementwise/runinference/)
 for doing inference using a machine learning model. We use a pipeline that 
reads a list of sentences, tokeinze the text, uses a Transformer based model 
`distilbert-base-uncased-finetuned-sst-2-english` for classifies the texts into 
two different classes using `RunInference`.
+
+We showcase different RunInference metrics when the pipeline is executed using 
Dataflow Runner on CPU and GPU. The full example code can be found 
[here](https://github.com/apache/beam/tree/master/sdks/python/apache_beam/examples/inference/runinference_metrics/).
+
+
+The file structure for entire pipeline is:
+
+    runinference_metrics/
+    ├── pipeline/
+    │   ├── __init__.py
+    │   ├── options.py
+    │   └── transformations.py
+    ├── __init__.py
+    ├── config.py
+    ├── main.py
+    └── setup.py
+
+`pipeline/transormations.py` contains the code for `beam.DoFn` and additional 
functions that are used for pipeline

Review Comment:
   ```suggestion
   `pipeline/transformations.py` contains the code for `beam.DoFn` and 
additional functions that are used for pipeline
   ```



##########
website/www/site/content/en/documentation/ml/runinference-metrics.md:
##########
@@ -0,0 +1,103 @@
+---
+title: "RunInference Metrics"
+---
+<!--
+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.
+-->
+
+# RunInference Metrics Example
+
+The main purpose of the example is to demonstrate and explain different 
metrics that are available when using 
[RunInference](https://beam.apache.org/documentation/transforms/python/elementwise/runinference/)
 for doing inference using a machine learning model. We use a pipeline that 
reads a list of sentences, tokeinze the text, uses a Transformer based model 
`distilbert-base-uncased-finetuned-sst-2-english` for classifies the texts into 
two different classes using `RunInference`.
+
+We showcase different RunInference metrics when the pipeline is executed using 
Dataflow Runner on CPU and GPU. The full example code can be found 
[here](https://github.com/apache/beam/tree/master/sdks/python/apache_beam/examples/inference/runinference_metrics/).
+
+
+The file structure for entire pipeline is:
+
+    runinference_metrics/
+    ├── pipeline/
+    │   ├── __init__.py
+    │   ├── options.py
+    │   └── transformations.py
+    ├── __init__.py
+    ├── config.py
+    ├── main.py
+    └── setup.py
+
+`pipeline/transormations.py` contains the code for `beam.DoFn` and additional 
functions that are used for pipeline
+
+`pipeline/options.py` contains the pipeline options to configure the Dataflow 
pipeline
+
+`config.py` defines some variables like GCP PROJECT_ID, NUM_WORKERS that are 
used multiple times
+
+`setup.py` defines the packages/requirements for the pipeline to run
+
+`main.py` contains the pipeline code and some additional functions used for 
running the pipeline
+
+
+### How to Run the Pipeline ?
+First, make sure you have installed the required packages. One should have 
access to a Google Cloud Project and then correctly configure the GCP variables 
like `PROJECT_ID`, `REGION`, and others in `config.py`. For using Dataflow with 
GPU, all the necessary setup instructions are mentioned here: 
https://github.com/GoogleCloudPlatform/python-docs-samples/tree/main/dataflow/gpu-examples/pytorch-minimal.
+
+
+1. Dataflow with CPU: `python main.py --mode cloud --device CPU`
+2. Dataflow with GPU: `python main.py --mode cloud --device GPU`
+
+The pipeline can be broken down into few simple steps:
+1. Create a list of texts to use it as an input using `beam.Create`
+2. Tokenizing the text
+3. Using RunInference to do inference
+4. Postprocessing the output of RunInference

Review Comment:
   ```suggestion
   2. Tokenize the text
   3. Use RunInference to do inference
   4. Postprocess the output of RunInference
   ```



##########
website/www/site/content/en/documentation/ml/runinference-metrics.md:
##########
@@ -0,0 +1,103 @@
+---
+title: "RunInference Metrics"
+---
+<!--
+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.
+-->
+
+# RunInference Metrics Example
+
+The main purpose of the example is to demonstrate and explain different 
metrics that are available when using 
[RunInference](https://beam.apache.org/documentation/transforms/python/elementwise/runinference/)
 for doing inference using a machine learning model. We use a pipeline that 
reads a list of sentences, tokeinze the text, uses a Transformer based model 
`distilbert-base-uncased-finetuned-sst-2-english` for classifies the texts into 
two different classes using `RunInference`.
+
+We showcase different RunInference metrics when the pipeline is executed using 
Dataflow Runner on CPU and GPU. The full example code can be found 
[here](https://github.com/apache/beam/tree/master/sdks/python/apache_beam/examples/inference/runinference_metrics/).
+
+
+The file structure for entire pipeline is:
+
+    runinference_metrics/
+    ├── pipeline/
+    │   ├── __init__.py
+    │   ├── options.py
+    │   └── transformations.py
+    ├── __init__.py
+    ├── config.py
+    ├── main.py
+    └── setup.py
+
+`pipeline/transormations.py` contains the code for `beam.DoFn` and additional 
functions that are used for pipeline
+
+`pipeline/options.py` contains the pipeline options to configure the Dataflow 
pipeline
+
+`config.py` defines some variables like GCP PROJECT_ID, NUM_WORKERS that are 
used multiple times
+
+`setup.py` defines the packages/requirements for the pipeline to run
+
+`main.py` contains the pipeline code and some additional functions used for 
running the pipeline
+
+
+### How to Run the Pipeline ?
+First, make sure you have installed the required packages. One should have 
access to a Google Cloud Project and then correctly configure the GCP variables 
like `PROJECT_ID`, `REGION`, and others in `config.py`. For using Dataflow with 
GPU, all the necessary setup instructions are mentioned here: 
https://github.com/GoogleCloudPlatform/python-docs-samples/tree/main/dataflow/gpu-examples/pytorch-minimal.
+
+
+1. Dataflow with CPU: `python main.py --mode cloud --device CPU`
+2. Dataflow with GPU: `python main.py --mode cloud --device GPU`
+
+The pipeline can be broken down into few simple steps:
+1. Create a list of texts to use it as an input using `beam.Create`
+2. Tokenizing the text
+3. Using RunInference to do inference
+4. Postprocessing the output of RunInference
+
+The code snippet for the pipeline is:
+
+{{< highlight >}}

Review Comment:
   ```suggestion
   
   {{< highlight >}}
   ```



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