tf.contrib.learn.Estimator

Estimator class is the basic TensorFlow model trainer/evaluator.

Inherits From: BaseEstimator

tf.contrib.learn.Estimator(
    model_fn=None, model_dir=None, config=None, params=None,
    feature_engineering_fn=None
)

THIS CLASS IS DEPRECATED. See contrib/learn/README.md for general migration instructions.

Args
model_fn	Model function. Follows the signature: Args: features: single Tensor or dict of Tensors (depending on data passed to fit), labels: Tensor or dict of Tensors (for multi-head models). If mode is ModeKeys.INFER, labels=None will be passed. If the model_fn's signature does not accept mode, the model_fn must still be able to handle labels=None. mode: Optional. Specifies if this training, evaluation or prediction. See ModeKeys. params: Optional dict of hyperparameters. Will receive what is passed to Estimator in params parameter. This allows to configure Estimators from hyper parameter tuning. config: Optional configuration object. Will receive what is passed to Estimator in config parameter, or the default config. Allows updating things in your model_fn based on configuration such as num_ps_replicas. model_dir: Optional directory where model parameters, graph etc are saved. Will receive what is passed to Estimator in model_dir parameter, or the default model_dir. Allows updating things in your model_fn that expect model_dir, such as training hooks. Returns: ModelFnOps Also supports a legacy signature which returns tuple of: predictions: Tensor, SparseTensor or dictionary of same. Can also be any type that is convertible to a Tensor or SparseTensor, or dictionary of same. loss: Scalar loss Tensor. train_op: Training update Tensor or Operation. Supports next three signatures for the function: (features, labels) -> (predictions, loss, train_op) (features, labels, mode) -> (predictions, loss, train_op) (features, labels, mode, params) -> (predictions, loss, train_op) (features, labels, mode, params, config) -> (predictions, loss, train_op) (features, labels, mode, params, config, model_dir) -> (predictions, loss, train_op)
model_dir	Directory to save model parameters, graph and etc. This can also be used to load checkpoints from the directory into a estimator to continue training a previously saved model.
config	Configuration object.
params	dict of hyper parameters that will be passed into model_fn. Keys are names of parameters, values are basic python types.
feature_engineering_fn	Feature engineering function. Takes features and labels which are the output of input_fn and returns features and labels which will be fed into model_fn. Please check model_fn for a definition of features and labels.

Raises
ValueError	parameters of model_fn don't match params.

Attributes
config
model_dir	Returns a path in which the eval process will look for checkpoints.
model_fn	Returns the model_fn which is bound to self.params.

Methods

evaluate

View source

evaluate(
    x=None, y=None, input_fn=None, feed_fn=None, batch_size=None, steps=None,
    metrics=None, name=None, checkpoint_path=None, hooks=None, log_progress=True
)

See Evaluable. (deprecated arguments)

Warning: SOME ARGUMENTS ARE DEPRECATED: (batch_size, x, y). They will be removed after 2016-12-01. Instructions for updating: Estimator is decoupled from Scikit Learn interface by moving into separate class SKCompat. Arguments x, y and batch_size are only available in the SKCompat class, Estimator will only accept input_fn. Example conversion: est = Estimator(...) -> est = SKCompat(Estimator(...))

Raises
ValueError	If at least one of x or y is provided, and at least one of input_fn or feed_fn is provided. Or if metrics is not None or dict.

export

View source

export(
    export_dir, input_fn=export._default_input_fn, input_feature_key=None,
    use_deprecated_input_fn=True, signature_fn=None, prediction_key=None,
    default_batch_size=1, exports_to_keep=None, checkpoint_path=None
)

Exports inference graph into given dir. (deprecated)

Warning: THIS FUNCTION IS DEPRECATED. It will be removed after 2017-03-25. Instructions for updating: Please use Estimator.export_savedmodel() instead.

Args
export_dir	A string containing a directory to write the exported graph and checkpoints.
input_fn	If use_deprecated_input_fn is true, then a function that given Tensor of Example strings, parses it into features that are then passed to the model. Otherwise, a function that takes no argument and returns a tuple of (features, labels), where features is a dict of string key to Tensor and labels is a Tensor that's currently not used (and so can be None).
input_feature_key	Only used if use_deprecated_input_fn is false. String key into the features dict returned by input_fn that corresponds to a the raw Example strings Tensor that the exported model will take as input. Can only be None if you're using a custom signature_fn that does not use the first arg (examples).
use_deprecated_input_fn	Determines the signature format of input_fn.
signature_fn	Function that returns a default signature and a named signature map, given Tensor of Example strings, dict of Tensors for features and Tensor or dict of Tensors for predictions.
prediction_key	The key for a tensor in the predictions dict (output from the model_fn) to use as the predictions input to the signature_fn. Optional. If None, predictions will pass to signature_fn without filtering.
default_batch_size	Default batch size of the Example placeholder.
exports_to_keep	Number of exports to keep.
checkpoint_path	the checkpoint path of the model to be exported. If it is None (which is default), will use the latest checkpoint in export_dir.

Returns
The string path to the exported directory. NB: this functionality was added ca. 2016/09/25; clients that depend on the return value may need to handle the case where this function returns None because subclasses are not returning a value.

export_savedmodel

View source

export_savedmodel(
    export_dir_base, serving_input_fn, default_output_alternative_key=None,
    assets_extra=None, as_text=False, checkpoint_path=None,
    graph_rewrite_specs=(GraphRewriteSpec((tag_constants.SERVING,), ()),),
    strip_default_attrs=False
)

Exports inference graph as a SavedModel into given dir.

Args
export_dir_base	A string containing a directory to write the exported graph and checkpoints.
serving_input_fn	A function that takes no argument and returns an InputFnOps.
default_output_alternative_key	the name of the head to serve when none is specified. Not needed for single-headed models.
assets_extra	A dict specifying how to populate the assets.extra directory within the exported SavedModel. Each key should give the destination path (including the filename) relative to the assets.extra directory. The corresponding value gives the full path of the source file to be copied. For example, the simple case of copying a single file without renaming it is specified as {'my_asset_file.txt': '/path/to/my_asset_file.txt'}.
as_text	whether to write the SavedModel proto in text format.
checkpoint_path	The checkpoint path to export. If None (the default), the most recent checkpoint found within the model directory is chosen.
graph_rewrite_specs	an iterable of GraphRewriteSpec. Each element will produce a separate MetaGraphDef within the exported SavedModel, tagged and rewritten as specified. Defaults to a single entry using the default serving tag ("serve") and no rewriting.
strip_default_attrs	Boolean. If True, default-valued attributes will be removed from the NodeDefs. For a detailed guide, see Stripping Default-Valued Attributes.

Returns
The string path to the exported directory.

Raises
ValueError	if an unrecognized export_type is requested.

fit

View source

fit(
    x=None, y=None, input_fn=None, steps=None, batch_size=None, monitors=None,
    max_steps=None
)

See Trainable. (deprecated arguments)

Warning: SOME ARGUMENTS ARE DEPRECATED: (batch_size, x, y). They will be removed after 2016-12-01. Instructions for updating: Estimator is decoupled from Scikit Learn interface by moving into separate class SKCompat. Arguments x, y and batch_size are only available in the SKCompat class, Estimator will only accept input_fn. Example conversion: est = Estimator(...) -> est = SKCompat(Estimator(...))

Raises
ValueError	If x or y are not None while input_fn is not None.
ValueError	If both steps and max_steps are not None.

get_params

View source

get_params(
    deep=True
)

Get parameters for this estimator.

Args
deep	boolean, optional If True, will return the parameters for this estimator and contained subobjects that are estimators.

Returns
params	mapping of string to any Parameter names mapped to their values.

get_variable_names

View source

get_variable_names()

Returns list of all variable names in this model.

Returns
List of names.

get_variable_value

View source

get_variable_value(
    name
)

Returns value of the variable given by name.

Args
name	string, name of the tensor.

Returns
Numpy array - value of the tensor.

partial_fit

View source

partial_fit(
    x=None, y=None, input_fn=None, steps=1, batch_size=None, monitors=None
)

Incremental fit on a batch of samples. (deprecated arguments)

Warning: SOME ARGUMENTS ARE DEPRECATED: (batch_size, x, y). They will be removed after 2016-12-01. Instructions for updating: Estimator is decoupled from Scikit Learn interface by moving into separate class SKCompat. Arguments x, y and batch_size are only available in the SKCompat class, Estimator will only accept input_fn. Example conversion: est = Estimator(...) -> est = SKCompat(Estimator(...))

This method is expected to be called several times consecutively on different or the same chunks of the dataset. This either can implement iterative training or out-of-core/online training.

This is especially useful when the whole dataset is too big to fit in memory at the same time. Or when model is taking long time to converge, and you want to split up training into subparts.

Args
x	Matrix of shape [n_samples, n_features...]. Can be iterator that returns arrays of features. The training input samples for fitting the model. If set, input_fn must be None.
y	Vector or matrix [n_samples] or [n_samples, n_outputs]. Can be iterator that returns array of labels. The training label values (class labels in classification, real numbers in regression). If set, input_fn must be None.
input_fn	Input function. If set, x, y, and batch_size must be None.
steps	Number of steps for which to train model. If None, train forever.
batch_size	minibatch size to use on the input, defaults to first dimension of x. Must be None if input_fn is provided.
monitors	List of BaseMonitor subclass instances. Used for callbacks inside the training loop.

Returns
self, for chaining.

Raises
ValueError	If at least one of x and y is provided, and input_fn is provided.

predict

View source

predict(
    x=None, input_fn=None, batch_size=None, outputs=None, as_iterable=True,
    iterate_batches=False
)

Returns predictions for given features. (deprecated arguments)

Warning: SOME ARGUMENTS ARE DEPRECATED: (as_iterable, batch_size, x). They will be removed after 2016-12-01. Instructions for updating: Estimator is decoupled from Scikit Learn interface by moving into separate class SKCompat. Arguments x, y and batch_size are only available in the SKCompat class, Estimator will only accept input_fn. Example conversion: est = Estimator(...) -> est = SKCompat(Estimator(...))

Args
x	Matrix of shape [n_samples, n_features...]. Can be iterator that returns arrays of features. The training input samples for fitting the model. If set, input_fn must be None.
input_fn	Input function. If set, x and 'batch_size' must be None.
batch_size	Override default batch size. If set, 'input_fn' must be 'None'.
outputs	list of str, name of the output to predict. If None, returns all.
as_iterable	If True, return an iterable which keeps yielding predictions for each example until inputs are exhausted. Note: The inputs must terminate if you want the iterable to terminate (e.g. be sure to pass num_epochs=1 if you are using something like read_batch_features).
iterate_batches	If True, yield the whole batch at once instead of decomposing the batch into individual samples. Only relevant when as_iterable is True.

Returns
A numpy array of predicted classes or regression values if the constructor's model_fn returns a Tensor for predictions or a dict of numpy arrays if model_fn returns a dict. Returns an iterable of predictions if as_iterable is True.

Raises
ValueError	If x and input_fn are both provided or both None.

set_params

View source

set_params(
    **params
)

Set the parameters of this estimator.

The method works on simple estimators as well as on nested objects (such as pipelines). The former have parameters of the form <component>__<parameter> so that it's possible to update each component of a nested object.

Args
**params	Parameters.

Returns
self

Raises
ValueError	If params contain invalid names.