Open source library for creating containers to run on Amazon SageMaker.
Project description
SageMaker Containers contains common functionality necessary to create a container compatible with SageMaker. It can be simply used by any container by just installing the module:
pip install sagemaker-containers
SageMaker Containers gives you tools to create SageMaker-compatible containers, and has additional tools for letting you create Frameworks (SageMaker-compatible containers that can run arbitrary Python scripts).
Currently, this library is used by:
Getting Started - Executing User Scripts on Amazon SageMaker
The objective of this tutorial is to explain how a script is executed inside any SageMaker-compatible container using SageMaker Containers.
Creating the training job
A SageMaker training job created using the SageMaker Python SDK takes a user script containing the model to be trained, the hyperparameters required by the script, and information about the input data. For example:
from sagemaker.chainer import Chainer
# for complete list of parameters, see
# https://github.com/aws/sagemaker-python-sdk#sagemaker-python-sdk-overview
estimator = Chainer(entry_point='user-script.py',
hyperparameters={'batch-size':256,
'learning-rate':0.0001,
'communicator':'pure_nccl'},
...)
# starts the training job with an input data channel named training pointing to
# s3://bucket/path/to/training/data
# for more information about data channels, see
# https://docs.aws.amazon.com/sagemaker/latest/dg/your-algorithms-training-algo.html#your-algorithms-training-algo-running-container-inputdataconfig
chainer_estimator.fit({'training': 's3://bucket/path/to/training/data', 'testing': 's3://bucket/path/to/testing/data')
For more on using the SageMaker Python SDK for interacting with the various frameworks, see their repsective documentation:
TensorFlow: https://github.com/aws/sagemaker-python-sdk#tensorflow-sagemaker-estimators
MXNet: https://sagemaker.readthedocs.io/en/stable/using_mxnet.html
PyTorch: https://github.com/aws/sagemaker-python-sdk#pytorch-sagemaker-estimators
Chainer: https://github.com/aws/sagemaker-python-sdk#chainer-sagemaker-estimators
How a script is executed inside the container
When the container starts for training, SageMaker Containers installs the user script as a Python module. The module name matches the script name. In the case above, user-script.py is transformed in a Python module named user-script.
After that, the Python interpreter executes the user module, passing hyperparameters as script arguments. The example above will be executed by SageMaker Containers as follow:
python -m user-script --batch-size 256 --learning_rate 0.0001 --communicator pure_nccl
A user provide script consumes the hyperparameters using any argument parsing library, for example:
if __name__ == '__main__':
parser = argparse.ArgumentParser()
parser.add_argument('--learning-rate', type=int, default=1)
parser.add_argument('--batch-size', type=int, default=64)
parser.add_argument('--communicator', type=str)
parser.add_argument('--frequency', type=int, default=20)
args = parser.parse_args()
...
Reading additional information from the container
Very often, a user script needs additional information from the container that is not available in hyperparameters. SageMaker Containers writes this information as environment variables that are available inside the script.
For example, the example above can read information about the training channel provided in the training job request:
if __name__ == '__main__':
parser = argparse.ArgumentParser()
...
# reads input channels training and testing from the environment variables
parser.add_argument('--training', type=str, default=os.environ['SM_CHANNEL_TRAINING'])
parser.add_argument('--testing', type=str, default=os.environ['SM_CHANNEL_TESTING'])
args = parser.parse_args()
...
List of provided environment variables by SageMaker Containers
The list of the environment variables is logged and available in CloudWatch logs. From the example above:
SM_NUM_GPUS=1
SM_NUM_CPUS=4
SM_NETWORK_INTERFACE_NAME=ethwe
SM_CURRENT_HOST=algo-1
SM_HOSTS=["algo-1","algo-2"]
SM_LOG_LEVEL=20
SM_USER_ARGS=["--batch-size","256","--learning-rate","0.0001","--communicator","pure_nccl"]
SM_HP_LEARNING_RATE=0.0001
SM_HP_BATCH-SIZE=10000
SM_HPS={"batch-size": '256', "learning-rate": "0.0001","communicator": "pure_nccl"}
SM_CHANNELS=["testing","training"]
SM_CHANNEL_TRAINING=/opt/ml/input/data/training
SM_CHANNEL_TESTING=/opt/ml/input/data/test
SM_MODULE_NAME=user_script
SM_MODULE_DIR=s3://sagemaker-{aws-region}-{aws-id}/{training-job-name}/source/sourcedir.tar.gz
SM_INPUT_DIR=/opt/ml/input
SM_INPUT_CONFIG_DIR=/opt/ml/input/config
SM_OUTPUT_DIR=/opt/ml/output
SM_OUTPUT_DATA_DIR=/opt/ml/output/data/algo-1
SM_MODEL_DIR=/opt/ml/model
SM_RESOURCE_CONFIG=
{
"current_host": "algo-1",
"hosts": [
"algo-1",
"algo-2"
]
}
SM_INPUT_DATA_CONFIG=
{
"test": {
"RecordWrapperType": "None",
"S3DistributionType": "FullyReplicated",
"TrainingInputMode": "File"
},
"train": {
"RecordWrapperType": "None",
"S3DistributionType": "FullyReplicated",
"TrainingInputMode": "File"
}
}
SM_FRAMEWORK_MODULE=sagemaker_chainer_container.training:main
SM_TRAINING_ENV=
{
"channel_input_dirs": {
"test": "/opt/ml/input/data/testing",
"train": "/opt/ml/input/data/training"
},
"current_host": "algo-1",
"framework_module": "sagemaker_chainer_container.training:main",
"hosts": [
"algo-1",
"algo-2"
],
"hyperparameters": {
"batch-size": 10000,
"epochs": 1
},
"input_config_dir": "/opt/ml/input/config",
"input_data_config": {
"test": {
"RecordWrapperType": "None",
"S3DistributionType": "FullyReplicated",
"TrainingInputMode": "File"
},
"train": {
"RecordWrapperType": "None",
"S3DistributionType": "FullyReplicated",
"TrainingInputMode": "File"
}
},
"input_dir": "/opt/ml/input",
"job_name": "preprod-chainer-2018-05-31-06-27-15-511",
"log_level": 20,
"model_dir": "/opt/ml/model",
"module_dir": "s3://sagemaker-{aws-region}-{aws-id}/{training-job-name}/source/sourcedir.tar.gz",
"module_name": "user_script",
"network_interface_name": "ethwe",
"num_cpus": 4,
"num_gpus": 1,
"output_data_dir": "/opt/ml/output/data/algo-1",
"output_dir": "/opt/ml/output",
"resource_config": {
"current_host": "algo-1",
"hosts": [
"algo-1",
"algo-2"
]
}
}
IMPORTANT ENVIRONMENT VARIABLES
These environment variables are those that you’re likely to use when writing a user script. A full list of environment variables is given below.
SM_MODEL_DIR
SM_MODEL_DIR=/opt/ml/model
When the training job finishes, the container will be deleted including its file system except for /opt/ml/model and /opt/ml/output. Use /opt/ml/model to save the model checkpoints. These checkpoints will be uploaded to the default S3 bucket. Usage example:
# using it in argparse
parser.add_argument('model_dir', type=str, default=os.environ['SM_MODEL_DIR'])
# using it as variable
model_dir = os.environ['SM_MODEL_DIR']
# saving checkpoints to model dir in chainer
serializers.save_npz(os.path.join(os.environ['SM_MODEL_DIR'], 'model.npz'), model)
For more information, see: How Amazon SageMaker Processes Training Output.
SM_CHANNELS
SM_CHANNELS='["testing","training"]'
Contains the list of input data channels in the container.
When you run training, you can partition your training data into different logical “channels”. Depending on your problem, some common channel ideas are: “training”, “testing”, “evaluation” or “images” and “labels”.
SM_CHANNELS includes the name of the available channels in the container as a JSON encoded list. Usage example:
import json
# using it in argparse
parser.add_argument('channel_names', type=int, default=json.loads(os.environ['SM_CHANNELS'])))
# using it as variable
channel_names = json.loads(os.environ['SM_CHANNELS']))
SM_CHANNEL_ {channel_name}
SM_CHANNEL_TRAINING='/opt/ml/input/data/training'
SM_CHANNEL_TESTING='/opt/ml/input/data/testing'
Contains the directory where the channel named channel_name is located in the container. Usage examples:
import json
parser.add_argument('--train', type=str, default=os.environ['SM_CHANNEL_TRAINING'])
parser.add_argument('--test', type=str, default=os.environ['SM_CHANNEL_TESTING'])
args = parser.parse_args()
train_file = np.load(os.path.join(args.train, 'train.npz'))
test_file = np.load(os.path.join(args.test, 'test.npz'))
SM_HPS
SM_HPS='{"batch-size": "256", "learning-rate": "0.0001","communicator": "pure_nccl"}'
Contains a JSON encoded dictionary with the user provided hyperparameters. Example usage:
import json
hyperparameters = json.loads(os.environ['SM_HPS']))
# {"batch-size": 256, "learning-rate": 0.0001, "communicator": "pure_nccl"}
SM_HP_ {hyperparameter_name}
SM_HP_LEARNING-RATE=0.0001
SM_HP_BATCH-SIZE=10000
SM_HP_COMMUNICATOR=pure_nccl
Contains value of the hyperparameter named hyperparameter_name. Usage examples:
learning_rate = float(os.environ['SM_HP_LEARNING-RATE'])
batch_size = int(os.environ['SM_HP_BATCH-SIZE'])
comminicator = os.environ['SM_HP_COMMUNICATOR']
SM_CURRENT_HOST
SM_CURRENT_HOST=algo-1
The name of the current container on the container network. Usage example:
# using it in argparse
parser.add_argument('current_host', type=str, default=os.environ['SM_CURRENT_HOST'])
# using it as variable
current_host = os.environ['SM_CURRENT_HOST']
SM_HOSTS
SM_HOSTS='["algo-1","algo-2"]'
JSON encoded list containing all the hosts . Usage example:
import json
# using it in argparse
parser.add_argument('hosts', type=nargs, default=json.loads(os.environ['SM_HOSTS']))
# using it as variable
hosts = json.loads(os.environ['SM_HOSTS'])
SM_NUM_GPUS
SM_NUM_GPUS=1
The number of gpus available in the current container. Usage example:
# using it in argparse
parser.add_argument('num_gpus', type=int, default=os.environ['SM_NUM_GPUS'])
# using it as variable
num_gpus = int(os.environ['SM_NUM_GPUS'])
Environment Variables full specification:
SM_NUM_CPUS
SM_NUM_CPUS=32
The number of cpus available in the current container. Usage example:
# using it in argparse
parser.add_argument('num_cpus', type=int, default=os.environ['SM_NUM_CPUS'])
# using it as variable
num_cpus = int(os.environ['SM_NUM_CPUS'])
SM_LOG_LEVEL
SM_LOG_LEVEL=20
The current log level in the container. Usage example:
import logging
logger = logging.getLogger(__name__)
logger.setLevel(int(os.environ.get('SM_LOG_LEVEL', logging.INFO)))
SM_NETWORK_INTERFACE_NAME
SM_NETWORK_INTERFACE_NAME=ethwe
Name of the network interface, useful for distributed training. Usage example:
# using it in argparse
parser.add_argument('network_interface', type=str, default=os.environ['SM_NETWORK_INTERFACE_NAME'])
# using it as variable
network_interface = os.environ['SM_NETWORK_INTERFACE_NAME']
SM_USER_ARGS
SM_USER_ARGS='["--batch-size","256","--learning_rate","0.0001","--communicator","pure_nccl"]'
JSON encoded list with the script arguments provided for training.
SM_INPUT_DIR
SM_INPUT_DIR=/opt/ml/input/
The path of the input directory, e.g. /opt/ml/input/ The input_dir, e.g. /opt/ml/input/, is the directory where SageMaker saves input data and configuration files before and during training.
SM_INPUT_CONFIG_DIR
SM_INPUT_DIR=/opt/ml/input/config
The path of the input directory, e.g. /opt/ml/input/config/. The directory where standard SageMaker configuration files are located, e.g. /opt/ml/input/config/.
SageMaker training creates the following files in this folder when training starts: - hyperparameters.json: Amazon SageMaker makes the hyperparameters in a CreateTrainingJob request available in this file. - inputdataconfig.json: You specify data channel information in the InputDataConfig parameter in a CreateTrainingJob request. Amazon SageMaker makes this information available in this file. - resourceconfig.json: name of the current host and all host containers in the training.
More information about this files can be find here: https://docs.aws.amazon.com/sagemaker/latest/dg/your-algorithms-training-algo.html
SM_OUTPUT_DATA_DIR
SM_OUTPUT_DATA_DIR=/opt/ml/output/data/algo-1
The dir to write non-model training artifacts (e.g. evaluation results) which will be retained by SageMaker, e.g. /opt/ml/output/data.
As your algorithm runs in a container, it generates output including the status of the training job and model and output artifacts. Your algorithm should write this information to the this directory.
SM_RESOURCE_CONFIG
SM_RESOURCE_CONFIG='{"current_host":"algo-1","hosts":["algo-1","algo-2"]}'
The contents from /opt/ml/input/config/resourceconfig.json. It has the following keys:
current_host: The name of the current container on the container network. For example, 'algo-1'.
hosts: The list of names of all containers on the container network, sorted lexicographically. For example, ['algo-1', 'algo-2', 'algo-3'] for a three-node cluster.
For more information about resourceconfig.json: https://docs.aws.amazon.com/sagemaker/latest/dg/your-algorithms-training-algo.html#your-algorithms-training-algo-running-container-dist-training
SM_INPUT_DATA_CONFIG
SM_INPUT_DATA_CONFIG='{
"testing": {
"RecordWrapperType": "None",
"S3DistributionType": "FullyReplicated",
"TrainingInputMode": "File"
},
"training": {
"RecordWrapperType": "None",
"S3DistributionType": "FullyReplicated",
"TrainingInputMode": "File"
}
}'
Input data configuration from /opt/ml/input/config/inputdataconfig.json.
For more information about inpudataconfig.json: https://docs.aws.amazon.com/sagemaker/latest/dg/your-algorithms-training-algo.html#your-algorithms-training-algo-running-container-dist-training
SM_TRAINING_ENV
SM_TRAINING_ENV='
{
"channel_input_dirs": {
"test": "/opt/ml/input/data/testing",
"train": "/opt/ml/input/data/training"
},
"current_host": "algo-1",
"framework_module": "sagemaker_chainer_container.training:main",
"hosts": [
"algo-1",
"algo-2"
],
"hyperparameters": {
"batch-size": 10000,
"epochs": 1
},
"input_config_dir": "/opt/ml/input/config",
"input_data_config": {
"test": {
"RecordWrapperType": "None",
"S3DistributionType": "FullyReplicated",
"TrainingInputMode": "File"
},
"train": {
"RecordWrapperType": "None",
"S3DistributionType": "FullyReplicated",
"TrainingInputMode": "File"
}
},
"input_dir": "/opt/ml/input",
"job_name": "preprod-chainer-2018-05-31-06-27-15-511",
"log_level": 20,
"model_dir": "/opt/ml/model",
"module_dir": "s3://sagemaker-{aws-region}-{aws-id}/{training-job-name}/source/sourcedir.tar.gz",
"module_name": "user_script",
"network_interface_name": "ethwe",
"num_cpus": 4,
"num_gpus": 1,
"output_data_dir": "/opt/ml/output/data/algo-1",
"output_dir": "/opt/ml/output",
"resource_config": {
"current_host": "algo-1",
"hosts": [
"algo-1",
"algo-2"
]
}
}'
Provides the entire training information as a JSON encoded dictionary.
License
This library is licensed under the Apache 2.0 License.
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