[jira] [Commented] (SPARK-23414) Plotting using matplotlib in MLlib pyspark
[ https://issues.apache.org/jira/browse/SPARK-23414?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16363029#comment-16363029 ] Sean Owen commented on SPARK-23414: --- matplotlib doesn't interact with Spark, so issues with using it are unlikely to be relevant to Spark itself anyway. > Plotting using matplotlib in MLlib pyspark > --- > > Key: SPARK-23414 > URL: https://issues.apache.org/jira/browse/SPARK-23414 > Project: Spark > Issue Type: Question > Components: MLlib >Affects Versions: 2.2.1 >Reporter: Waleed Esmail >Priority: Major > > Dear MLlib experts, > I just want to plot a fancy confusion matrix (true values vs predicted > values) like the one produced by seaborn module in python, so I did the > following: > {code:java} > labelIndexer = StringIndexer(inputCol="label", > outputCol="indexedLabel").fit(output) > # Automatically identify categorical features, and index them. > # We specify maxCategories so features with > 4 distinct values are treated > as continuous. > featureIndexer = VectorIndexer(inputCol="features", > outputCol="indexedFeatures").fit(output) > # Split the data into training and test sets (30% held out for testing) > (trainingData, testData) = output.randomSplit([0.7, 0.3]) > dt = DecisionTreeClassifier(labelCol="indexedLabel", > featuresCol="indexedFeatures", maxDepth=15) > # Chain indexers and tree in a Pipeline > pipeline = Pipeline(stages=[labelIndexer, featureIndexer, dt]) > # Train model. This also runs the indexers. > model = pipeline.fit(trainingData) > # Make predictions. > predictions = model.transform(testData) > predictionAndLabels = predictions.select("prediction", "indexedLabel") > y_predicted = np.array(predictions.select("prediction").collect()) > y_test = np.array(predictions.select("indexedLabel").collect()) > from sklearn.metrics import confusion_matrix > import matplotlib.ticker as ticker > figcm, ax = plt.subplots() > cm = confusion_matrix(y_test, y_predicted) > # for normalization > cm = cm.astype('float') / cm.sum(axis=1)[:, np.newaxis] > sns.heatmap(cm, square=True, annot=True, cbar=False) > plt.xlabel('predication') > plt.ylabel('true value') > {code} > is this the right way to do it?!. please note that I am new to Spark and MLlib > > thank you in advance, -- This message was sent by Atlassian JIRA (v7.6.3#76005) - To unsubscribe, e-mail: issues-unsubscr...@spark.apache.org For additional commands, e-mail: issues-h...@spark.apache.org
[jira] [Commented] (SPARK-23414) Plotting using matplotlib in MLlib pyspark
[ https://issues.apache.org/jira/browse/SPARK-23414?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16363025#comment-16363025 ] Waleed Esmail commented on SPARK-23414: --- I am sorry, I didn't get it, what do you mean by "orthogonal"?!. > Plotting using matplotlib in MLlib pyspark > --- > > Key: SPARK-23414 > URL: https://issues.apache.org/jira/browse/SPARK-23414 > Project: Spark > Issue Type: Question > Components: MLlib >Affects Versions: 2.2.1 >Reporter: Waleed Esmail >Priority: Major > > Dear MLlib experts, > I just want to plot a fancy confusion matrix (true values vs predicted > values) like the one produced by seaborn module in python, so I did the > following: > {code:java} > labelIndexer = StringIndexer(inputCol="label", > outputCol="indexedLabel").fit(output) > # Automatically identify categorical features, and index them. > # We specify maxCategories so features with > 4 distinct values are treated > as continuous. > featureIndexer = VectorIndexer(inputCol="features", > outputCol="indexedFeatures").fit(output) > # Split the data into training and test sets (30% held out for testing) > (trainingData, testData) = output.randomSplit([0.7, 0.3]) > dt = DecisionTreeClassifier(labelCol="indexedLabel", > featuresCol="indexedFeatures", maxDepth=15) > # Chain indexers and tree in a Pipeline > pipeline = Pipeline(stages=[labelIndexer, featureIndexer, dt]) > # Train model. This also runs the indexers. > model = pipeline.fit(trainingData) > # Make predictions. > predictions = model.transform(testData) > predictionAndLabels = predictions.select("prediction", "indexedLabel") > y_predicted = np.array(predictions.select("prediction").collect()) > y_test = np.array(predictions.select("indexedLabel").collect()) > from sklearn.metrics import confusion_matrix > import matplotlib.ticker as ticker > figcm, ax = plt.subplots() > cm = confusion_matrix(y_test, y_predicted) > # for normalization > cm = cm.astype('float') / cm.sum(axis=1)[:, np.newaxis] > sns.heatmap(cm, square=True, annot=True, cbar=False) > plt.xlabel('predication') > plt.ylabel('true value') > {code} > is this the right way to do it?!. please note that I am new to Spark and MLlib > > thank you in advance, -- This message was sent by Atlassian JIRA (v7.6.3#76005) - To unsubscribe, e-mail: issues-unsubscr...@spark.apache.org For additional commands, e-mail: issues-h...@spark.apache.org