Overview


In today's smartphone world, mobile games are able to attract large audience resulting large number of game studios developing mobile games.

People have large variety of games to play resulting higher churn rate and revenue loss.


Problem Statement


Predict whether a particular user will abandon the game or not.


Our Approach


To solve the problem, we use IntelliHub . Lets see how IntelliHub works:

  • First user needs to uploads the train as well as test data.
  • It is stored in the cloud.
  • Data from cloud then goes to PhoenixML (a Machine Learning Module in IntelliHub ). In PhoenixML, you have 4 ML Libraries (Weka, H2O, TensorFlow & Scikit-learn) to choose from.
  • Using PhoenixML, you train a model.
  • You can evaluate using RMSE, accuracy and other different metrics.
  • You can then use the above model for prediction.


Data Definition


The data set contains information about 2000 players. The variables in the data set are:

  • User_id: Player unique identification number
  • Achievements: Number of times a player was rewarded for successfully completing a level collecting all possible coin
  • Challenges: Number of challenges completed
  • No_of_sessions: Number of times a particular player opened the game
  • Session_length: Total time a player played the game (in minutes)
  • Coin_earned: Coins collected while playing a game
  • Coin_spent: Coins spent either to buy something or get extra life
  • Player_activity.Bal:Either player is churned or is active (Label)

Studio gives the flexibility of choosing features upto 20 columns.



Model Building


  • We want to create a model in which it can predict either a particular player will churn in the near future or not.
  • This can help to run player retention campaign for that particular player.
  • We will be building classification models using two algorithms: NaiveBayesMultinomial & RandomForest on IntelliHub .

We will evaluate & compare each model and accordingly choose the best model for our test dataset.

While doing our modeling with PhoenixML we will be using some terminologies:

  • Training Data : The data you use for training your model. It contains all the information you have collected about the problem statement.
  • Test Data : The data you use for testing the model. You can make predictions on this data.
  • Features : These are all the columns in your dataset which you use for training your model.
  • Class/Label : This is the column which identifies the particular record and the one you want to predict.
  • Accuracy : This is the percentage of data correctly predicted when you apply the model to your data.

First we need to create an App from console and enable API for PhoenixML.In Studio, we can build model in two ways:

  • Using SDK (For Developer)
  • Using Interface (For Non-Developer)


Using SDK


If you want to develop a model using SDK, just copy API key from IntelliHub Console.




Connect To Studio

Description

You can access the services provided by enabling API for PhoenixML. IntelliHub provides StudioClient where you have to pass your APP KEY as an argument.

Code


import studio

c = studio.StudioClient("YOUR API KEY")
 

import com.spotflock.StudioClient;

StudioClient c = new StudioClient("YOUR API KEY");
 

Upload Train And Test Files

Description

As Studio is a cloud platform, It stores Train and Test Files remotely. File upload API will return file storage locations from Cloud Storage in response.

Upload Train File


train_file_store_response = c.store("path/to/train/file")

train_data = train_file_store_response["fileUrl"]
 

JSONObject train_file_store_response = c.store("path/to/test/file");
JSONObject  train_data= train_file_store_response("fileUrl");
System.out.println(train_data.toString());
 

train_data file url

'/spotflock-studio-prod/xxxxx@xxxxxxxx.com/1551936734455-player_train.csv'

Upload Test File


test_file_store_response = c.store("path/to/test/file")

test_data = test_file_store_response["fileUrl"]
 

JSONObject test_file_store_response = c.store("path/to/test/file");
JSONObject test_data = test_file_store_response("fileUrl");
System.out.println(test_data.toString());
 

test_data file url

'/spotflock-studio-prod/xxxxx@xxxxxxx.com/1551936725437-player_test.csv'

Classification Model

Description

This API would enable you to train a Classification model. The model takes some time to be trained and thus the job status has to be checked. Once the job is completed, the job output API would give you the model info.

Arguments

lib Library for training the model. Currently we are supporting spotflock and weka libraries.
service Valid parameter values are classification and regression.
model_name Model name and with this name model will be saved.
algorithm Algorithm by which model will be trained.
dataset_url Train dataset file location in Spotflock storage.
label Label of the column in train dataset file.
train_percentage % of data will be used for training and model will be tested against remaining % of data.
features Column names list which is used to train regression model.
save_model If True, model will be saved.

Code


train_response = c.train("classification", "RandomForest", train_data, "player_activity",
["Achievements","Challenges","Session_length","No_of_sessions","Coin_earned","Coin_spent"],
"Player Churn Model - RandomForest","weka", 80, True)

train_response

{
  'code': 200,
 'data': {'jobId': 395,
  'appId': 1555904646616,
  'name': 'weka_classification_train',
  'library': 'weka',
  'service': 'Classification',
  'task': 'TRAIN',
  'state': 'RUN',
  'startTime': '2019-04-25T11:26:33.864+0000',
  'endTime': None,
  'request': {'library': 'weka',
   'config': {'datasetUrl': '/spotflock-studio/xxxxxxx@gmail.com/1556191223344-Player_Log.csv',
    'algorithm': 'RandomForest',
    'saveModel': True,
    'label': 'player_activity',
    'features': ['Achievements',
                 'Challenges',
                 'Session_length',
                 'No_of_sessions',
                 'Coin_earned',
                 'Coin_spent'],
    'name': 'Player Churn Model - RandomForest',
    'trainPercentage': 70,
    'params': {}}}}}

Similarly, we will build another model using NaiveBayesMultinomial algorithm.

Code


train_response_NBM = c.train("classification", "NaiveBayesMultinomial", train_data, "Player_activity",
["Achievements","Challenges","Session_length","No_of_sessions","Coin_earned",
"Coin_spent"],"Player Churn Model - NaiveBayesMultinomial","weka", 80, True)

train_response_NBM

{
  'code': 200,
  'data': {'jobId': 396,
  'appId': 1555904646616,
  'name': 'weka_classification_train',
  'library': 'weka',
  'service': 'Classification',
  'task': 'TRAIN',
  'state': 'RUN',
  'startTime': '2019-04-25T11:26:59.094+0000',
  'endTime': None,
  'request': {'library': 'weka',
   'config': {'datasetUrl': '/spotflock-studio/xxxxxxx@gmail.com/1556191223344-Player_Log.csv',
    'algorithm': 'NaiveBayesMultinomial',
    'saveModel': True,
    'label': 'player_activity',
    'features': ['Achievements',
                 'Challenges',
                 'Session_length',
                 'No_of_sessions',
                 'Coin_earned',
                 'Coin_spent'],
    'name': 'Player Churn Model - NaiveBayesMultinomial',
    'trainPercentage': 80,
    'params': {}}}}}
lib Library for training the model. Currently we are supporting spotflock and weka libraries.
service Valid parameter values are classification and regression.
modelName Model name and with this name model will be saved.
algorithm Algorithm by which model will be trained.
datasetUrl Train dataset file location in Spotflock storage.
label Label of the column in train dataset file.
trainPercentage % of data will be used for training and model will be tested against remaining % of data.
features Column names list which is used to train regression model.
saveModel If True, model will be saved.

Code


JSONArray features = new JSONArray();
features.put("Achievements");
features.put("Challenges");
features.put("Session_length");
features.put("No_of_sessions");
features.put("Coin_earned");
features.put("Coin_spent");

JSONObject params = new JSONObject();
params.put("lib","weka");
params.put("saveModel",true);
params.put("trainPercentage",80);
params.put("modelName","Player Churn Model - RandomForest");

String response = c.train("classification","RandomForest", trainData, 
"Player_activity", features, params); JSONObject trainResponse = new JSONObject(response);

trainResponse


{
	"code": 200,
 	"data":
 	{
 		"jobId": 444,
  		"appId": 1555944250593,
  		"name": "weka_classification_train",
  		"library": "weka",
  		"service": "Classification",
  		"task": "TRAIN",
  		"state": "RUN",
  		"startTime": "2019-04-29T06:52:47.976+0000",
  		"endTime": null,
  		"request": {
  		"library": "weka",
   		"config": {
   			"datasetUrl": "/spotflock-studio/xxxxxx@xxxxxx.com/1556520753513-Train_Loan.csv",
    		"algorithm": "Logistic",
    		"saveModel": true,
    		"label": "Player_activity",
    		"features": ["Achievements",
                         "Challenges",
                         "Session_length",
                         "No_of_sessions",
                         "Coin_earned",
                         "Coin_spent"],
    		"name": "Player Churn Model - RandomForest",
    		"trainPercentage": 80,
    		"params": {}
    		}
    	}
    }
}

Similarly, we will build another model using NaiveBayesMultinomial algorithm.

Code


JSONArray features = new JSONArray();
features.put("CurrentLoanAmount");
features.put("Credit_Score");
features.put("MonthlyDebt");
features.put("Yr_Credit_His");

JSONObject params = new JSONObject();
params.put("lib","weka");
params.put("saveModel",true);
params.put("trainPercentage",80);
params.put("modelName","Player Churn Model - NaiveBayesMultinomial");

String response = c.train("classification","NaiveBayesMultinomial", trainData, 
"Player_activity", features, params); JSONObject trainResponseNBM = new JSONObject(response);

trainResponseNBM


{
	"code": 200,
 	"data":
 	{
 		"jobId": 445,
  		"appId": 1555944250593,
  		"name": "weka_classification_train",
  		"library": "weka",
  		"service": "Classification",
  		"task": "TRAIN",
  		"state": "RUN",
  		"startTime": "2019-04-29T06:52:47.976+0000",
  		"endTime": null,
  		"request": {
  		"library": "weka",
   		"config": {
   			"datasetUrl": "/spotflock-studio/xxxxxx@xxxxxx.com/1556520753513-Train_Loan.csv",
    		"algorithm": "NaiveBayesMultinomial",
    		"saveModel": true,
    		"label": "Player_activity",
    		"features": ["Achievements",
                         "Challenges",
                         "Session_length",
                         "No_of_sessions",
                         "Coin_earned",
                         "Coin_spent"],
    		"name": "Player Churn Model - NaiveBayesMultinomial",
    		"trainPercentage": 80,
    		"params": {}
    		}
    	}
    }
}

Get Train Job Status

Description

The train/predict jobs take some amount of time to be completed and so their status can be checked with this API.

Code


train_job_status_response = c.job_status(train_response["data"]["jobId"])
 

train_job_status_response


{
    "jobId":438,
    "appId":1555904646616,
    "Name":"weka_classification_train",
    "Library":"weka",
    "service":"Classification",
    "task":"TRAIN",
    "state":"FINISH",
    "startTime":"2019-04-25T11:26:33.864+0000",
    "endTime":"2019-04-25T11:26:38.689+0000"
}


train_job_status_response_NBM = c.job_status(train_response_NBM["data"]["jobId"])
 

train_job_status_response_NBM


{
  "jobId":439,
  "appId":1555944250593,
  "name":"weka_classification_train",
  "library":"weka",
  "service":"classification",
  "task":"TRAIN",
  "state":"FINISH",
  "startTime":"2019-04-29T05:55:00.499+0000",
  "endTime":"2019-04-29T05:55:02.234+0000"
}

JSONObject trainJobStatusResponse = c.jobStatus(trainResponse.getJSONObject("data")
.get("jobId")); System.out.println(trainJobStatusResponse.toString());

trainJobStatusResponse


{
  "jobId":438,
  "appId":1555944250593,
  "name":"weka_classification_train",
  "library":"weka",
  "service":"classification",
  "task":"TRAIN",
  "state":"FINISH",
  "startTime":"2019-04-29T05:55:00.499+0000",
  "endTime":"2019-04-29T05:55:02.234+0000"
}

JSONObject trainJobStatusResponseNBM = c.jobStatus(trainResponseNBM.getAsJsonObject("data")
.get("jobId")); System.out.println(trainJobStatusResponse.toString());

trainJobStatusResponseNBM


{
  "jobId":438,
  "appId":1555944250593,
  "name":"weka_classification_train",
  "library":"weka",
  "service":"classification",
  "task":"TRAIN",
  "state":"FINISH",
  "startTime":"2019-04-29T05:55:00.499+0000",
  "endTime":"2019-04-29T05:55:02.234+0000"
}

Get Train Job Output

Description

Once the job status is completed, the job output can be retrieved from this API.

Code


train_job_output_response = c.job_output(train_response["data"]["jobId"])
 

train_job_output_response


{'id': 343,
 'jobId': 395,
 'output': {'eval': {'kappa': 0.9013287725299303,
   'recall': {'Active': 0.9935344827586207, 'Churned': 0.875},
   'correct': 580.0,
   'accuracy': 96.66666666666667,
   'rocCurve': {'values': [[1.0, 1.0],
     [0.9926, 1.0],
     [0.9853, 1.0],...},
   'errorRate': 0.03333333333333333,
   'inCorrect': 20.0,
   'precision': {'Active': 0.9644351464435147, 'Churned': 0.9754098360655737},
   'areaUnderPRC': {'Active': 0.9986191814630054,
    'Churned': 0.9834324571790051},
   'areaUnderROC': {'Active': 0.9959115111561866,
    'Churned': 0.9959115111561866},
   'priorEntropy': 0.7735670912290766,
   'confusionMatrix': [[119.0, 17.0], [3.0, 461.0]],
   'numTrueNegatives': {'Active': 119.0, 'Churned': 461.0},
   'numTruePositives': {'Active': 461.0, 'Churned': 119.0},
   'trueNegativeRate': {'Active': 0.875, 'Churned': 0.9935344827586207},
   'truePositiveRate': {'Active': 0.9935344827586207, 'Churned': 0.875},
   'falseNegativeRate': {'Active': 0.00646551724137931, 'Churned': 0.125},
   'falsePositiveRate': {'Active': 0.125, 'Churned': 0.00646551724137931},
   'numFalseNegatives': {'Active': 3.0, 'Churned': 17.0},
   'numFalsePositives': {'Active': 17.0, 'Churned': 3.0},
   'pearsonCorrelation': {'Challenges': 0.2727450704708272,
    'Coin_spent': 0.28607374154837806,
    'Coin_earned': 0.27218790086896255,
    'Achievements': 0.18328111059683977,
    'No_of_sessions': 0.19543025560325186,
    'Session_length': 0.27076482505618493},
   'confusionMatrixHeaders': ['Churned', 'Active'],
   'mathewsCorrelationCoefficient': {'Active': 0.9034864557683286,
    'Churned': 0.9034864557683286}},
  'modelUrl': '/spotflock-studio/22/1556191223344-Player_Churn_Model_-_RandomForest_3156348600223223355.mdl'}}


                            

train_job_output_response_NBM = c.job_output(train_response_NBM["data"]["jobId"])
 

train_job_output_response_NBM


                                {'id': 343,
 'jobId': 395,
 'output': {'eval': {'kappa': -0.04213287725299303,
   'recall': {'Active': 0.9935344827586207, 'Churned': 0.875},
   'correct': 580.0,
   'accuracy': 56.17666666666667,
   'rocCurve': {'values': [[1.0, 1.0],
     [0.9926, 1.0],
     [0.9853, 1.0],...},
   'errorRate': 0.438333333333333333,
   'inCorrect': 20.0,
   'precision': {'Active': 0.9644351464435147, 'Churned': 0.9754098360655737},
   'areaUnderPRC': {'Active': 0.9986191814630054,
    'Churned': 0.9834324571790051},
   'areaUnderROC': {'Active': 0.9959115111561866,
    'Churned': 0.9959115111561866},
   'priorEntropy': 0.7875670912290766,
   'confusionMatrix': [[119.0, 17.0], [3.0, 461.0]],
   'numTrueNegatives': {'Active': 119.0, 'Churned': 461.0},
   'numTruePositives': {'Active': 461.0, 'Churned': 119.0},
   'trueNegativeRate': {'Active': 0.875, 'Churned': 0.9935344827586207},
   'truePositiveRate': {'Active': 0.9935344827586207, 'Churned': 0.875},
   'falseNegativeRate': {'Active': 0.00646551724137931, 'Churned': 0.125},
   'falsePositiveRate': {'Active': 0.125, 'Churned': 0.00646551724137931},
   'numFalseNegatives': {'Active': 3.0, 'Churned': 17.0},
   'numFalsePositives': {'Active': 17.0, 'Churned': 3.0},
   'pearsonCorrelation': {'Challenges': 0.2727450704708272,
    'Coin_spent': 0.28607374154837806,
    'Coin_earned': 0.27218790086896255,
    'Achievements': 0.18328111059683977,
    'No_of_sessions': 0.19543025560325186,
    'Session_length': 0.27076482505618493},
   'confusionMatrixHeaders': ['Churned', 'Active'],
   'mathewsCorrelationCoefficient': {'Active': 0.9034864557683286,
    'Churned': 0.9034864557683286}},
  'modelUrl': '/spotflock-studio/22/1556191223344-Player_Churn_Model_-_RandomForest_3156348600223223344.mdl'}}
                            

Code


JSONObject trainJobOutputResponse = c.jobOutput(trainResponse.getJSONObject("data")
.get("jobId")); System.out.println(trainJobOutputResponse.toString());

trainJobOutputResponse


                                {"id": 343,
 "jobId": 395,
 "output": {"eval": {"kappa": -0.04213287725299303,
   "recall": {"Active": 0.9935344827586207, "Churned": 0.875},
   "correct": 580.0,
   "accuracy": 56.17666666666667,
   "rocCurve": {"values": [[1.0, 1.0],
     [0.9926, 1.0],
     [0.9853, 1.0],...},
   "errorRate": 0.438333333333333333,
   "inCorrect": 20.0,
   "precision": {"Active": 0.9644351464435147, "Churned": 0.9754098360655737},
   "areaUnderPRC": {"Active": 0.9986191814630054,
    "Churned": 0.9834324571790051},
   "areaUnderROC": {"Active": 0.9959115111561866,
    "Churned": 0.9959115111561866},
   "priorEntropy": 0.7875670912290766,
   "confusionMatrix": [[119.0, 17.0], [3.0, 461.0]],
   "numTrueNegatives": {"Active": 119.0, "Churned": 461.0},
   "numTruePositives": {"Active": 461.0, "Churned": 119.0},
   "trueNegativeRate": {"Active": 0.875, "Churned": 0.9935344827586207},
   "truePositiveRate": {"Active": 0.9935344827586207, "Churned": 0.875},
   "falseNegativeRate": {"Active": 0.00646551724137931, "Churned": 0.125},
   "falsePositiveRate": {"Active": 0.125, "Churned": 0.00646551724137931},
   "numFalseNegatives": {"Active": 3.0, "Churned": 17.0},
   "numFalsePositives": {"Active": 17.0, "Churned": 3.0},
   "pearsonCorrelation": {"Challenges": 0.2727450704708272,
    "Coin_spent": 0.28607374154837806,
    "Coin_earned": 0.27218790086896255,
    "Achievements": 0.18328111059683977,
    "No_of_sessions": 0.19543025560325186,
    "Session_length": 0.27076482505618493},
   "confusionMatrixHeaders": ["Churned", "Active"],
   "mathewsCorrelationCoefficient": {"Active": 0.9034864557683286,
    "Churned": 0.9034864557683286}},
  "modelUrl": "/spotflock-studio/22/1556191223344-Player_Churn_Model_-_RandomForest_31563486002232234.mdl"}}
                            

JSONObject trainJobOutputResponseNBM = c.jobOutput(trainResponseNBM.getJSONObject("data")
.get("jobId")); System.out.println(trainJobOutputResponse.toString());

trainJobOutputResponseNBM


                                {"id": 343,
 "jobId": 395,
 "output": {"eval": {"kappa": -0.04213287725299303,
   "recall": {"Active": 0.9935344827586207, "Churned": 0.875},
   "correct": 580.0,
   "accuracy": 56.17666666666667,
   "rocCurve": {"values": [[1.0, 1.0],
     [0.9926, 1.0],
     [0.9853, 1.0],...},
   "errorRate": 0.438333333333333333,
   "inCorrect": 20.0,
   "precision": {"Active": 0.9644351464435147, "Churned": 0.9754098360655737},
   "areaUnderPRC": {"Active": 0.9986191814630054,
    "Churned": 0.9834324571790051},
   "areaUnderROC": {"Active": 0.9959115111561866,
    "Churned": 0.9959115111561866},
   "priorEntropy": 0.7875670912290766,
   "confusionMatrix": [[119.0, 17.0], [3.0, 461.0]],
   "numTrueNegatives": {"Active": 119.0, "Churned": 461.0},
   "numTruePositives": {"Active": 461.0, "Churned": 119.0},
   "trueNegativeRate": {"Active": 0.875, "Churned": 0.9935344827586207},
   "truePositiveRate": {"Active": 0.9935344827586207, "Churned": 0.875},
   "falseNegativeRate": {"Active": 0.00646551724137931, "Churned": 0.125},
   "falsePositiveRate": {"Active": 0.125, "Churned": 0.00646551724137931},
   "numFalseNegatives": {"Active": 3.0, "Churned": 17.0},
   "numFalsePositives": {"Active": 17.0, "Churned": 3.0},
   "pearsonCorrelation": {"Challenges": 0.2727450704708272,
    "Coin_spent": 0.28607374154837806,
    "Coin_earned": 0.27218790086896255,
    "Achievements": 0.18328111059683977,
    "No_of_sessions": 0.19543025560325186,
    "Session_length": 0.27076482505618493},
   "confusionMatrixHeaders": ["Churned", "Active"],
   "mathewsCorrelationCoefficient": {"Active": 0.9034864557683286,
    "Churned": 0.9034864557683286}},
  "modelUrl": "/spotflock-studio/22/1556191223344-Player_Churn_Model_-_RandomForest_315634860022322334.mdl"}}
                            

Evaluation Metrics

kappa The Kappa statistic (or value) is a metric that compares an Observed Accuracy with an Expected Accuracy (random chance).
recall Recall is also referred to as the true positive rate or sensitivity.
correct Correct is given by total number of correctly predicted values.
accuracy This is the ratio of the number of correct predictions out of all predictions made.
rocCurve ROC (Receiver Operating Characteristic) Curve is to examine the performance of a binary classifier, by creating a graph of the True Positives vs. False Positives.
errorRate Error Rate is the ratio of total number of incorrectly predicted instances to total number of instances.
inCorrect Incorrect is given by total number of incorrectly predicted values.
precision The precision for a class is the number of true positives divided by the total number of elements labeled as belonging to the positive class.
areaUnderPRC total area calculated under PRC (Precision Recall Curve) curve.
areaUnderROC total area calculated under ROC curve.
priorEntropy Entropy is a measure of the uncertainty associated with a random variable.
numTrueNegatives Total number of instances predicted correctly as Negative.
numTruePositives Total number of instances predicted correctly as Positive.
trueNegativeRate Ratio of number of True Negatives to total number of negatives.
truePositiveRate Ratio of number of True Positives to total number of positives.
falseNegativeRate Ratio of number of False Negatives to total number of negatives.
falsePositiveRate Ratio of number of False Positives to total number of positives.
numFalseNegatives Total number of instances where incorrectly predicted as Negatives instead of Positives.
numFalsePositives Total number of instances where incorrectly predicted as Positives instead of Negatives.
pearsonCorrelation Evaluates the worth of an attribute by measuring the pearsonCorrelation between it and the target.
confusionMatrixHeaders You can create confusion matrix in the order of confusion Matrix headers.
correlationCoefficient This parameter tells you how much true value and predicted value are related. It gives values between −1 and 1, where 0 is no relation, 1 is a very strong Linear Relation and −1 is an Inverse Linear Relation.
mathewsCorrelationCoefficient The Matthews Correlation Coefficient has a range of -1 to 1 where -1 indicates a completely wrong binary classifier while 1 indicates a completely correct binary classifier.

Model Selection

We have built two models:

Model Accuracy Kappa Error Rate Prior Entropy
RandomForest 96.83% 0.911 0.032 0.806
NaiveBayesMultinomial 56.17%% -0.042 0.438 0.787

Based on the above result, we would select Logistic model for prediction.

Get Model Url

Description

After Train job is finished, you can get the model url.

Code


model = train_job_output_response["output"]["modelUrl"]
 

String model = trainJobOutputResponse.getJSONObject("output").get("modelUrl");
 

By Printing model

'/spotflock-studio/22/1556191223344-Player_Churn_Model_-_RandomForest_3156348600223223355.mdl'

Predict on Test Data

Description

The below code is to predict on test data by passing the model url that was obtained from previous response.

Code


predict_response = c.predict("classification", test_data, model,"weka")
 

predict_response

{'code': 200,
 'data': {'jobId': 446,
  'appId': 1555944250593,
  'name': 'weka_classification_predict',
  'library': 'weka',
  'service': 'Classification',
  'task': 'PREDICT',
  'state': 'RUN',
  'startTime': '2019-04-29T06:53:51.738+0000',
  'endTime': None,
  'request': {'library': 'weka',
   'config': {'modelUrl': '/spotflock-studio-prod/22/1556520769304-Loan_Model_-_Logistic_Regression_5146553929183771197.mdl',
    'params': {},
    'datasetUrl': '/spotflock-studio/xxxxxx@spotflock.com/1556520761816-Test_Loan.csv'}}}}


params = new JSONObject();
params.put("lib","weka");
JSONObject predictResponse = c.predict("classification", testData, model, params);
 

predictResponse


{"code": 200,
 "data": {"jobId": 446,
  "appId": 1555944250593,
  "name": "weka_classification_predict",
  "library": "weka",
  "service": "Classification",
  "task": "PREDICT",
  "state": "RUN",
  "startTime": "2019-04-29T06:53:51.738+0000",
  "endTime": null,
  "request": {"library": "weka",
   "config": {"modelUrl": "/spotflock-studio-prod/22/1556520769304-Loan_Model_-_Logistic_Regression_5146553929183771197.mdl",
    "params": {},
    "datasetUrl": "/spotflock-studio/xxxxxx@spotflock.com/1556520761816-Test_Loan.csv"}}}}
                                               

Get Prediction Job Status

Description

The train/predict jobs take some amount of time to be completed and so their status can be checked with this API.

Code


predict_job_status_response = c.job_status(predict_response["data"]["jobId"])
 

predict_job_status_response


JSONObject predictJobStatusResponse = c.jobStatus(predictResponse.getJSONObject("data")
.get("jobId"));

predictJobStatusResponse


{
  "jobId":439,
  "appId":1555944250593,
  "name":"weka_regression_predict",
  "library":"weka",
  "service":"Regression",
  "task":"PREDICT",
  "state":"FINISH",
  "startTime":"2019-04-29T05:55:27.324+0000",
  "endTime":"2019-04-29T05:55:33.962+0000"
}

Get Prediction Job Output

Description

Once the job status is completed, the job output can be retrieved from this API.

Code


predict_job_output_response = c.job_output(predict_response["data"]["jobId"])
 

predict_job_output_response

{
    "id": 173,
    "jobId": 161,
    "output": {
        "reqId": 161,
        "predFileUrl": "/spotflock-studio/22/1551864223344-prediction.csv"
    }
}

JSONObject predictJobOutputResponse = c.jobOutput(predictResponse.getJSONObject("data")
.get("jobId")); System.out.println(predictJobOutputResponse.toString());

predictJobOutputResponse

{
    "id": 182,
    "jobId": 437,
    "output": {
        "reqId": 211,
        "predFileUrl": "/spotflock-studio-prod/22/1552024447138-prediction.csv"
    }
}

Get Prediction File Url

Description

Once the Predict job is completed, get the prediction file url.

Code


pred_file = predict_job_output_response['output']['predFileUrl']
 

String pred_file = predictJobOutputResponse.getJSONObject("output").get("predFileUrl")
 

pred_file

'/spotflock-studio-prod/22/1552024447138-prediction.csv'

Download Prediction File

Description

You can download the predicted file as csv by using below code.

Code


prediction_response = c.download(pred_file)
import io
import pandas as pd
df = pd.read_csv(io.StringIO(prediction_response.text))
df.to_csv('pred_file.csv')

prediction_response



Achievements,Challenges,Session_length,No_of_sessions,Coin_earned,Coin_spent
6.0,44.0,98.0,50.0,43.0,32.0,Active,0.04644,0.95356
1.0,9.0,20.0,50.0,43.0,32.0,Active,0.164163,0.835837
0.0,1.0,0.0,50.0,43.0,32.0,Active,0.252699,0.747301
0.0,0.0,0.0,50.0,43.0,32.0,Active,0.23988,0.76012
...
...
                                                

JSONObject predictionResponse = c.download(pred_file);
FileWriter outputfile = new FileWriter(ENTER YOUR OUTPUT FILE PATH);
CSVWriter writer = new CSVWriter(outputfile);
writer.writeAll(prediction_response.toString());
writer.close();
 

predictionResponse


Achievements,Challenges,Session_length,No_of_sessions,Coin_earned,Coin_spent
6.0,44.0,98.0,50.0,43.0,32.0,Active,0.04644,0.95356
1.0,9.0,20.0,50.0,43.0,32.0,Active,0.164163,0.835837
0.0,1.0,0.0,50.0,43.0,32.0,Active,0.252699,0.747301
0.0,0.0,0.0,50.0,43.0,32.0,Active,0.23988,0.76012
...
...
                                                




Using Interface (Non-Developer)


  1. Once we have created an App we need to go to the Phoenix ML.

  2. Once we are at the Phoenix ML dashboard we can see that the App is enabled.

  3. Before we can train our model, we need to upload the dataset in Dataset Management.

    Navigate to Dataset Management
    Uploading Train & Test dataset
  4. After we have uploaded the training data, we create a new model and need to configure it.

    1. First you need to name your model.
    2. How you want to split your data like train and validation..
    3. Type of Model ie Classification or Regression. Here we are using Classification
    4. We will select Random Forest as our algorithm.
    5. Now we have to select our training dataset which we uploaded earlier.
    6. Select features from the list which you want to use for building the model. Here we are using all features except Item_Identifier and Item_Outlet_Sales.
    7. Label is our target variable that is player activity.
    8. And then click Train.

  5. After we come back to the Phoenix ML>Explore dashboard which has a list of all the models trained.

  6. After the model gets trained if success it will show a green TRAINED flag and if it has failed the it gets represented with a red FAILED flag. Reason for model fail can be incorrect data type in the dataset like you label (Target variable) is categorical variable while using Linear Regression.

    Same way we will create new model but this time we will use NaiveBayesMultinomial Algorithm and name the model ‘Player Churn Model - NaiveBayesMultinomial’.

    Once the model gets successfully completed we can see the results i.e the Pearson’s Correlation graph, Accuracy, Kappa, Error rate , Prior Entropy and ROC curve for both the models.

    RandomForest Model Result
    NaiveBayesMultinomial Model Result
  7. Model Selection:

    We have built two models:

    Model Accuracy Kappa Error Rate Prior Entropy
    RandomForest 96.83% 0.911 0.032 0.806
    NaiveBayesMultinomial 56.17%% -0.042 0.438 0.787
  8. Predicting Test Data

    To predict the player activity for the test data, we need to come back to the Phoenix ML>Explore dashboard which has a list of all the models trained. We can go to the predict option. And enter the model name and the test dataset we want to use.

    We will select ‘Player Churn Model - RandomForest’.

  9. After the successful compilation of the predictive model we will get the results. It will predict player activity as churn and active. You will also get churn probability and active probability. We can view the results in a separate window or download a csv file.

    Prediction Result


Summary


  • This model helps us in determining set of players who will probably churn.
  • We can give this players certain incentives like coins so that they can buy extra lives, unlock level,etc.
  • We can also explore characteristics of this probable churns and determine the purpose of churn. Accordingly we can make changes the experience for player retention.

Helpdesk