msmbuilder.featurizer.AtomPairsFeaturizer¶
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class
msmbuilder.featurizer.
AtomPairsFeaturizer
(pair_indices, periodic=False, exponent=1.0)¶ Featurizer based on distances between specified pairs of atoms.
This featurizer transforms a dataset containing MD trajectories into a vector dataset by representing each frame in each of the MD trajectories by a vector of the distances between the specified pairs of atoms.
Parameters: - pair_indices : np.ndarray, shape=(n_pairs, 2), dtype=int
Each row gives the indices of two atoms involved in the interaction.
- periodic : bool, default=False
If periodic is True and the trajectory contains unitcell information, we will compute distances under the minimum image convention.
- exponent : float
Modify the distances by raising them to this exponent.
Methods
describe_features
(traj)Return a list of dictionaries describing the atom pair features. fit_transform
(X[, y])Fit to data, then transform it. get_params
([deep])Get parameters for this estimator. partial_transform
(traj)Featurize an MD trajectory into a vector space via pairwise atom-atom distances set_params
(**params)Set the parameters of this estimator. summarize
()Return some diagnostic summary statistics about this Markov model transform
(traj_list[, y])Featurize a several trajectories. featurize fit -
__init__
(pair_indices, periodic=False, exponent=1.0)¶ Initialize self. See help(type(self)) for accurate signature.
Methods
__init__
(pair_indices[, periodic, exponent])Initialize self. describe_features
(traj)Return a list of dictionaries describing the atom pair features. featurize
(traj)fit
(traj_list[, y])fit_transform
(X[, y])Fit to data, then transform it. get_params
([deep])Get parameters for this estimator. partial_transform
(traj)Featurize an MD trajectory into a vector space via pairwise atom-atom distances set_params
(**params)Set the parameters of this estimator. summarize
()Return some diagnostic summary statistics about this Markov model transform
(traj_list[, y])Featurize a several trajectories. -
describe_features
(traj)¶ Return a list of dictionaries describing the atom pair features.
Parameters: - traj : mdtraj.Trajectory
The trajectory to describe
Returns: - feature_descs : list of dict
Dictionary describing each feature with the following information about the atoms participating in each dihedral
- resnames: unique names of residues
- atominds: the two atom inds
- resseqs: unique residue sequence ids (not necessarily 0-indexed)
- resids: unique residue ids (0-indexed)
- featurizer: AtomPairsFeaturizer
- featuregroup: Distance.
- other info : Value of the exponent
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fit_transform
(X, y=None, **fit_params)¶ Fit to data, then transform it.
Fits transformer to X and y with optional parameters fit_params and returns a transformed version of X.
Parameters: - X : numpy array of shape [n_samples, n_features]
Training set.
- y : numpy array of shape [n_samples]
Target values.
Returns: - X_new : numpy array of shape [n_samples, n_features_new]
Transformed array.
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get_params
(deep=True)¶ Get parameters for this estimator.
Parameters: - 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.
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partial_transform
(traj)¶ Featurize an MD trajectory into a vector space via pairwise atom-atom distances
Parameters: - traj : mdtraj.Trajectory
A molecular dynamics trajectory to featurize.
Returns: - features : np.ndarray, dtype=float, shape=(n_samples, n_features)
A featurized trajectory is a 2D array of shape (length_of_trajectory x n_features) where each features[i] vector is computed by applying the featurization function to the `i`th snapshot of the input trajectory.
See also
transform
- simultaneously featurize a collection of MD trajectories
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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 latter have parameters of the form
<component>__<parameter>
so that it’s possible to update each component of a nested object.Returns: - self
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summarize
()¶ Return some diagnostic summary statistics about this Markov model
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transform
(traj_list, y=None)¶ Featurize a several trajectories.
Parameters: - traj_list : list(mdtraj.Trajectory)
Trajectories to be featurized.
Returns: - features : list(np.ndarray), length = len(traj_list)
The featurized trajectories. features[i] is the featurized version of traj_list[i] and has shape (n_samples_i, n_features)