W3cubDocs

/TensorFlow Python

tf.contrib.learn.LinearRegressor

Class `LinearRegressor`

Inherits From: Estimator

Defined in tensorflow/contrib/learn/python/learn/estimators/linear.py.

See the guide: Learn (contrib) > Estimators

Linear regressor model.

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

Train a linear regression model to predict label value given observation of feature values.

Example:

sparse_column_a = sparse_column_with_hash_bucket(...)
sparse_column_b = sparse_column_with_hash_bucket(...)

sparse_feature_a_x_sparse_feature_b = crossed_column(...)

estimator = LinearRegressor(
    feature_columns=[sparse_column_a, sparse_feature_a_x_sparse_feature_b])

# Input builders
def input_fn_train: # returns x, y
  ...
def input_fn_eval: # returns x, y
  ...
estimator.fit(input_fn=input_fn_train)
estimator.evaluate(input_fn=input_fn_eval)
estimator.predict(x=x)

Input of fit and evaluate should have following features, otherwise there will be a KeyError:

if weight_column_name is not None: key=weight_column_name, value=a Tensor
for column in feature_columns:
if isinstance(column, SparseColumn): key=column.name, value=a SparseTensor
if isinstance(column, WeightedSparseColumn): {key=id column name, value=a SparseTensor, key=weight column name, value=a SparseTensor}
if isinstance(column, RealValuedColumn): key=column.name, value=a Tensor

Properties

`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.

Returns:

The model_fn with the following signature: def model_fn(features, labels, mode, metrics)

Methods

`init`

__init__(
    feature_columns,
    model_dir=None,
    weight_column_name=None,
    optimizer=None,
    gradient_clip_norm=None,
    enable_centered_bias=False,
    label_dimension=1,
    _joint_weights=False,
    config=None,
    feature_engineering_fn=None
)

Construct a LinearRegressor estimator object.

Args:

feature_columns: An iterable containing all the feature columns used by the model. All items in the set should be instances of classes derived from FeatureColumn.
model_dir: Directory to save model parameters, graph, etc. This can also be used to load checkpoints from the directory into a estimator to continue training a previously saved model.
weight_column_name: A string defining feature column name representing weights. It is used to down weight or boost examples during training. It will be multiplied by the loss of the example.
optimizer: An instance of tf.Optimizer used to train the model. If None, will use an Ftrl optimizer.
gradient_clip_norm: A float > 0. If provided, gradients are clipped to their global norm with this clipping ratio. See tf.clip_by_global_norm for more details.
enable_centered_bias: A bool. If True, estimator will learn a centered bias variable for each class. Rest of the model structure learns the residual after centered bias.
label_dimension: Number of regression targets per example. This is the size of the last dimension of the labels and logits Tensor objects (typically, these have shape [batch_size, label_dimension]).
_joint_weights: If True use a single (possibly partitioned) variable to store the weights. It's faster, but requires all feature columns are sparse and have the 'sum' combiner. Incompatible with SDCAOptimizer.
config: RunConfig object to configure the runtime settings.
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 the model.

Returns:

A LinearRegressor estimator.

`evaluate`

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)

SOME ARGUMENTS ARE DEPRECATED. 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`

export(
    export_dir,
    input_fn=None,
    input_feature_key=None,
    use_deprecated_input_fn=True,
    signature_fn=None,
    default_batch_size=1,
    exports_to_keep=None
)

See BaseEstimator.export. (deprecated)

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

`export_savedmodel`

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`

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

See Trainable. (deprecated arguments)

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`

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`

get_variable_names()

Returns list of all variable names in this model.

Returns:

List of names.

`get_variable_value`

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`

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)

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`

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

Returns predictions for given features. (deprecated arguments) (deprecated arguments)

SOME ARGUMENTS ARE DEPRECATED. They will be removed after 2016-09-15. Instructions for updating: The default behavior of predict() is changing. The default value for as_iterable will change to True, and then the flag will be removed altogether. The behavior of this flag is described below.

SOME ARGUMENTS ARE DEPRECATED. They will be removed after 2017-03-01. Instructions for updating: Please switch to predict_scores, or set outputs argument.

By default, returns predicted scores. But this default will be dropped soon. Users should either pass outputs, or call predict_scores method.

Args:

x: features.
input_fn: Input function. If set, x must be None.
batch_size: Override default batch size.
outputs: list of str, name of the output to predict. If None, returns scores.
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).

Returns:

Numpy array of predicted scores (or an iterable of predicted scores if as_iterable is True). If label_dimension == 1, the shape of the output is [batch_size], otherwise the shape is [batch_size, label_dimension]. If outputs is set, returns a dict of predictions.

`predict_scores`

predict_scores(
    x=None,
    input_fn=None,
    batch_size=None,
    as_iterable=True
)

Returns predicted scores for given features. (deprecated arguments)

Args:

x: features.
input_fn: Input function. If set, x must be None.
batch_size: Override default batch size.
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).

Returns:

`set_params`

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.

© 2018 The TensorFlow Authors. All rights reserved.
Licensed under the Creative Commons Attribution License 3.0.
Code samples licensed under the Apache 2.0 License.
https://www.tensorflow.org/api_docs/python/tf/contrib/learn/LinearRegressor

tf.contrib.learn.LinearRegressor

Class LinearRegressor

Properties

config

model_dir

model_fn

Returns:

Methods

__init__

Args:

Returns:

evaluate

Raises:

export

export_savedmodel

Args:

Returns:

Raises:

fit

Raises:

get_params

Args:

Returns:

get_variable_names

Returns:

get_variable_value

Args:

Returns:

partial_fit

Args:

Returns:

Raises:

predict

Args:

Returns:

predict_scores

Args:

Returns:

set_params

Args:

Returns:

Raises:

Class `LinearRegressor`

`config`

`model_dir`

`model_fn`

`init`

`evaluate`

`export`

`export_savedmodel`

`fit`

`get_params`

`get_variable_names`

`get_variable_value`

`partial_fit`

`predict`

`predict_scores`

`set_params`