view predict_tool_usage.py @ 0:9bf25dbe00ad draft

"planemo upload for repository https://github.com/bgruening/galaxytools/tree/recommendation_training/tools/tool_recommendation_model commit 7fac577189d01cedd01118a77fc2baaefe7d5cad"

"""
Predict tool usage to weigh the predicted tools
"""

import os
import numpy as np
import warnings
import csv
import collections

from sklearn.svm import SVR
from sklearn.model_selection import GridSearchCV
from sklearn.pipeline import Pipeline

import utils

warnings.filterwarnings("ignore")

main_path = os.getcwd()


class ToolPopularity:

    @classmethod
    def __init__(self):
        """ Init method. """

    @classmethod
    def extract_tool_usage(self, tool_usage_file, cutoff_date, dictionary):
        """
        Extract the tool usage over time for each tool
        """
        tool_usage_dict = dict()
        all_dates = list()
        all_tool_list = list(dictionary.keys())
        with open(tool_usage_file, 'rt') as usage_file:
            tool_usage = csv.reader(usage_file, delimiter='\t')
            for index, row in enumerate(tool_usage):
                if (str(row[1]) > cutoff_date) is True:
                    tool_id = utils.format_tool_id(row[0])
                    if tool_id in all_tool_list:
                        all_dates.append(row[1])
                        if tool_id not in tool_usage_dict:
                            tool_usage_dict[tool_id] = dict()
                            tool_usage_dict[tool_id][row[1]] = int(row[2])
                        else:
                            curr_date = row[1]
                            # merge the usage of different version of tools into one
                            if curr_date in tool_usage_dict[tool_id]:
                                tool_usage_dict[tool_id][curr_date] += int(row[2])
                            else:
                                tool_usage_dict[tool_id][curr_date] = int(row[2])
        # get unique dates
        unique_dates = list(set(all_dates))
        for tool in tool_usage_dict:
            usage = tool_usage_dict[tool]
            # extract those dates for which tool's usage is not present in raw data
            dates_not_present = list(set(unique_dates) ^ set(usage.keys()))
            # impute the missing values by 0
            for dt in dates_not_present:
                tool_usage_dict[tool][dt] = 0
            # sort the usage list by date
            tool_usage_dict[tool] = collections.OrderedDict(sorted(usage.items()))
        return tool_usage_dict

    @classmethod
    def learn_tool_popularity(self, x_reshaped, y_reshaped):
        """
        Fit a curve for the tool usage over time to predict future tool usage
        """
        epsilon = 0.0
        cv = 5
        s_typ = 'neg_mean_absolute_error'
        n_jobs = 4
        s_error = 1
        iid = True
        tr_score = False
        try:
            pipe = Pipeline(steps=[('regressor', SVR(gamma='scale'))])
            param_grid = {
                'regressor__kernel': ['rbf', 'poly', 'linear'],
                'regressor__degree': [2, 3]
            }
            search = GridSearchCV(pipe, param_grid, iid=iid, cv=cv, scoring=s_typ, n_jobs=n_jobs, error_score=s_error, return_train_score=tr_score)
            search.fit(x_reshaped, y_reshaped.ravel())
            model = search.best_estimator_
            # set the next time point to get prediction for
            prediction_point = np.reshape([x_reshaped[-1][0] + 1], (1, 1))
            prediction = model.predict(prediction_point)
            if prediction < epsilon:
                prediction = [epsilon]
            return prediction[0]
        except Exception:
            return epsilon

    @classmethod
    def get_pupularity_prediction(self, tools_usage):
        """
        Get the popularity prediction for each tool
        """
        usage_prediction = dict()
        for tool_name, usage in tools_usage.items():
            y_val = list()
            x_val = list()
            for x, y in usage.items():
                x_val.append(x)
                y_val.append(y)
            x_pos = np.arange(len(x_val))
            x_reshaped = x_pos.reshape(len(x_pos), 1)
            y_reshaped = np.reshape(y_val, (len(x_pos), 1))
            prediction = np.round(self.learn_tool_popularity(x_reshaped, y_reshaped), 8)
            usage_prediction[tool_name] = prediction
        return usage_prediction