Add support for TensorFlow script mode and Python 3

CHANGELOG.rst

@@ -24,6 +24,7 @@ CHANGELOG
 * build: added pylint
 * build: upgrade docker-compose to 1.23
 * enhancement: Frameworks: update warning for not setting framework_version as we aren't planning a breaking change anymore
+* feature: Estimator: add script mode and Python 3 support for TensorFlow
 * enhancement: Session: remove hardcoded 'training' from job status error message
 * bug-fix: Updated Cloudwatch namespace for metrics in TrainingJobsAnalytics
 * bug-fix: Changes to use correct s3 bucket and time range for dataframes in TrainingJobAnalytics.

src/sagemaker/estimator.py

@@ -610,6 +610,7 @@ class Framework(EstimatorBase):
     """
 
     __framework_name__ = None
+    LAUNCH_PS_ENV_NAME = 'sagemaker_parameter_server_enabled'
 
     def __init__(self, entry_point, source_dir=None, hyperparameters=None, enable_cloudwatch_metrics=False,
                  container_log_level=logging.INFO, code_location=None, image_name=None, **kwargs):

src/sagemaker/fw_utils.py

@@ -31,6 +31,9 @@
                                   'If you would like to use version {latest}, ' \
                                   'please add framework_version={latest} to your constructor.'
 
+EMPTY_FRAMEWORK_VERSION_ERROR = 'framework_version is required for script mode estimator. ' \
+                                'Please add framework_version={} to your constructor to avoid this error.'
+
 VALID_PY_VERSIONS = ['py2', 'py3']
 
 

src/sagemaker/mxnet/estimator.py

@@ -30,7 +30,6 @@ class MXNet(Framework):
     __framework_name__ = 'mxnet'
 
     _LOWEST_SCRIPT_MODE_VERSION = ['1', '3']
-    LAUNCH_PS_ENV_NAME = 'sagemaker_parameter_server_enabled'
     LATEST_VERSION = '1.3'
 
     def __init__(self, entry_point, source_dir=None, hyperparameters=None, py_version='py2',

src/sagemaker/tensorflow/estimator.py

@@ -22,8 +22,7 @@
 import time
 
 from sagemaker.estimator import Framework
-from sagemaker.fw_utils import framework_name_from_image, framework_version_from_tag, \
-    empty_framework_version_warning
+import sagemaker.fw_utils as fw
 from sagemaker.tensorflow.defaults import TF_VERSION
 from sagemaker.tensorflow.model import TensorFlowModel
 from sagemaker.tensorflow.serving import Model
@@ -34,6 +33,16 @@
 LOGGER = logging.getLogger('sagemaker')
 
 
+_FRAMEWORK_MODE_ARGS = ('training_steps', 'evaluation_steps', 'requirements_file', 'checkpoint_path')
+_SCRIPT_MODE = 'tensorflow-scriptmode'
+_SCRIPT_MODE_SERVING_ERROR_MSG = 'Script mode containers does not support serving yet. ' \
+                                 'Please use our new tensorflow-serving container by creating the model ' \
+                                 'with \'endpoint_type\' set to \'tensorflow-serving\'.'
+_SCRIPT_MODE_TENSORBOARD_WARNING = 'Tensorboard is not supported with script mode. You can run the following ' \
+                                   'command: tensorboard --logdir {} --host localhost --port 6006 This can be ' \
+                                   'run from anywhere with access to the S3 URI used as the logdir.'
+
+
 class Tensorboard(threading.Thread):
     def __init__(self, estimator, logdir=None):
         """Initialize ``Tensorboard`` instance.
@@ -163,9 +172,9 @@ class TensorFlow(Framework):
 
     __framework_name__ = 'tensorflow'
 
-    def __init__(self, training_steps=None, evaluation_steps=None, checkpoint_path=None,
-                 py_version='py2', framework_version=None, requirements_file='', image_name=None,
-                 **kwargs):
+    def __init__(self, training_steps=None, evaluation_steps=None, checkpoint_path=None, py_version='py2',
+                 framework_version=None, model_dir=None, requirements_file='', image_name=None,
+                 script_mode=False, distributions=None, **kwargs):
         """Initialize an ``TensorFlow`` estimator.
         Args:
             training_steps (int): Perform this many steps of training. `None`, the default means train forever.
@@ -176,6 +185,9 @@ def __init__(self, training_steps=None, evaluation_steps=None, checkpoint_path=N
             py_version (str): Python version you want to use for executing your model training code (default: 'py2').
             framework_version (str): TensorFlow version you want to use for executing your model training code.
                 List of supported versions https://github.com/aws/sagemaker-python-sdk#tensorflow-sagemaker-estimators
+            model_dir (str): S3 location where the checkpoint data and models can be exported to during training
+                (default: None). If not specified a default S3 URI will be generated. It will be passed in the
+                training script as one of the command line arguments.
             requirements_file (str): Path to a ``requirements.txt`` file (default: ''). The path should be within and
                 relative to ``source_dir``. Details on the format can be found in the
                 `Pip User Guide <https://pip.pypa.io/en/stable/reference/pip_install/#requirements-file-format>`_.
@@ -185,21 +197,61 @@ def __init__(self, training_steps=None, evaluation_steps=None, checkpoint_path=N
                     Examples:
                         123.dkr.ecr.us-west-2.amazonaws.com/my-custom-image:1.0
                         custom-image:latest.
+            script_mode (bool): If set to True will the estimator will use the Script Mode containers (default: False).
+                This will be ignored if py_version is set to 'py3'.
+            distribution (dict): A dictionary with information on how to run distributed training
+                (default: None). Currently we only support distributed training with parameter servers. To enable it
+                use the following setup:
+                    {
+                        'parameter_server':
+                        {
+                            'enabled': True
+                        }
+                    }
             **kwargs: Additional kwargs passed to the Framework constructor.
         """
         if framework_version is None:
-            LOGGER.warning(empty_framework_version_warning(TF_VERSION, TF_VERSION))
+            LOGGER.warning(fw.empty_framework_version_warning(TF_VERSION, TF_VERSION))
         self.framework_version = framework_version or TF_VERSION
 
         super(TensorFlow, self).__init__(image_name=image_name, **kwargs)
         self.checkpoint_path = checkpoint_path
         self.py_version = py_version
         self.training_steps = training_steps
         self.evaluation_steps = evaluation_steps
+        self.model_dir = model_dir
+        self.script_mode = script_mode
+        self.distributions = distributions or {}
 
+        self._validate_args(py_version=py_version, script_mode=script_mode, framework_version=framework_version,
+                            training_steps=training_steps, evaluation_steps=evaluation_steps,
+                            requirements_file=requirements_file, checkpoint_path=checkpoint_path)
         self._validate_requirements_file(requirements_file)
         self.requirements_file = requirements_file
 
+    def _validate_args(self, py_version, script_mode, framework_version, training_steps,
+                       evaluation_steps, requirements_file, checkpoint_path):
+
+        if py_version == 'py3' or script_mode:
+
+            if framework_version is None:
+                raise AttributeError(fw.EMPTY_FRAMEWORK_VERSION_ERROR)
+
+            found_args = []
+            if training_steps:
+                found_args.append('training_steps')
+            if evaluation_steps:
+                found_args.append('evaluation_steps')
+            if requirements_file:
+                found_args.append('requirements_file')
+            if checkpoint_path:
+                found_args.append('checkpoint_path')
+            if found_args:
+                raise AttributeError(
+                    '{} are deprecated in script mode. Please do not set {}.'
+                    .format(', '.join(_FRAMEWORK_MODE_ARGS), ', '.join(found_args))
+                )
+
     def _validate_requirements_file(self, requirements_file):
         if not requirements_file:
             return
@@ -245,7 +297,10 @@ def fit_super():
         if run_tensorboard_locally and wait is False:
             raise ValueError("Tensorboard is not supported with async fit")
 
-        if run_tensorboard_locally:
+        if self._script_mode_enabled() and run_tensorboard_locally:
+            LOGGER.warning(_SCRIPT_MODE_TENSORBOARD_WARNING.format(self.model_dir))
+            fit_super()
+        elif run_tensorboard_locally:
             tensorboard = Tensorboard(self)
             tensorboard.validate_requirements()
 
@@ -275,13 +330,13 @@ def _prepare_init_params_from_job_description(cls, job_details, model_channel_na
                                                                                        model_channel_name)
 
         # Move some of the tensorflow specific init params from hyperparameters into the main init params.
-        for argument in ['checkpoint_path', 'training_steps', 'evaluation_steps']:
+        for argument in ('checkpoint_path', 'training_steps', 'evaluation_steps', 'model_dir'):
             value = init_params['hyperparameters'].pop(argument, None)
             if value is not None:
                 init_params[argument] = value
 
         image_name = init_params.pop('image')
-        framework, py_version, tag = framework_name_from_image(image_name)
+        framework, py_version, tag = fw.framework_name_from_image(image_name)
         if not framework:
             # If we were unable to parse the framework name from the image it is not one of our
             # officially supported images, in this case just add the image to the init params.
@@ -294,7 +349,7 @@ def _prepare_init_params_from_job_description(cls, job_details, model_channel_na
         # containing framework version, device type and python version (e.g. '1.5-gpu-py2').
         # For backward compatibility map deprecated image tag '1.0' to a '1.4' framework version
         # otherwise extract framework version from the tag itself.
-        init_params['framework_version'] = '1.4' if tag == '1.0' else framework_version_from_tag(
+        init_params['framework_version'] = '1.4' if tag == '1.0' else fw.framework_version_from_tag(
             tag)
 
         training_job_name = init_params['base_job_name']
@@ -328,7 +383,7 @@ def create_model(self, model_server_workers=None, role=None,
         """
 
         role = role or self.role
-        if endpoint_type == 'tensorflow-serving':
+        if endpoint_type == 'tensorflow-serving' or self._script_mode_enabled():
             return self._create_tfs_model(role=role, vpc_config_override=vpc_config_override)
 
         return self._create_default_model(model_server_workers=model_server_workers, role=role,
@@ -362,18 +417,39 @@ def hyperparameters(self):
         """Return hyperparameters used by your custom TensorFlow code during model training."""
         hyperparameters = super(TensorFlow, self).hyperparameters()
 
-        if not self.checkpoint_path:
-            local_code = get_config_value('local.local_code', self.sagemaker_session.config)
-            if self.sagemaker_session.local_mode and local_code:
-                self.checkpoint_path = '/opt/ml/shared/checkpoints'
-            else:
-                self.checkpoint_path = os.path.join(self.output_path,
-                                                    self._current_job_name, 'checkpoints')
+        self.checkpoint_path = self.checkpoint_path or self._default_s3_path('checkpoints')
 
-        additional_hyperparameters = {'checkpoint_path': self.checkpoint_path,
-                                      'training_steps': self.training_steps,
-                                      'evaluation_steps': self.evaluation_steps,
-                                      'sagemaker_requirements': self.requirements_file}
+        if self._script_mode_enabled():
+            self.model_dir = self.model_dir or self._default_s3_path('model')
+            additional_hyperparameters = {'model_dir': self.model_dir}
+            if 'parameter_server' in self.distributions:
+                enabled = self.distributions['parameter_server'].get('enabled', False)
+                additional_hyperparameters[self.LAUNCH_PS_ENV_NAME] = enabled
+        else:
+            additional_hyperparameters = {'checkpoint_path': self.checkpoint_path,
+                                          'training_steps': self.training_steps,
+                                          'evaluation_steps': self.evaluation_steps,
+                                          'sagemaker_requirements': self.requirements_file}
 
         hyperparameters.update(Framework._json_encode_hyperparameters(additional_hyperparameters))
         return hyperparameters
+
+    def _default_s3_path(self, directory):
+        local_code = get_config_value('local.local_code', self.sagemaker_session.config)
+        if self.sagemaker_session.local_mode and local_code:
+            return '/opt/ml/shared/{}'.format(directory)
+        else:
+            return os.path.join(self.output_path, self._current_job_name, directory)
+
+    def _script_mode_enabled(self):
+        return self.py_version == 'py3' or self.script_mode
+
+    def train_image(self):
+        if self.image_name:
+            return self.image_name
+
+        if self._script_mode_enabled():
+            return fw.create_image_uri(self.sagemaker_session.boto_region_name, _SCRIPT_MODE,
+                                       self.train_instance_type, self.framework_version, self.py_version)
+
+        return super(TensorFlow, self).train_image()