1590173760

Tensorboard is the best tool for visualizing many metrics while training and validating a neural network. In most of the case, we need to look for more details like how a model is performing on validation data. Sometimes training and validation loss and accuracy are not enough, we need to figure out the performance of validation data. One of the ways is to visualize using a confusion matrix.

#tensorflow #confusion-matrix #machine-learning

1590173760

Tensorboard is the best tool for visualizing many metrics while training and validating a neural network. In most of the case, we need to look for more details like how a model is performing on validation data. Sometimes training and validation loss and accuracy are not enough, we need to figure out the performance of validation data. One of the ways is to visualize using a confusion matrix.

#tensorflow #confusion-matrix #machine-learning

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Before we switch into the topic, lets understand why we need to consider Confusion matrix and metrics ?

Metrics plays a major role in evaluating the performance of the model.

Metrics from Confusion Matrix.

- Confusion Matrix (Precision, Recall, F score, Accuracy)

Confusion Matrix is no more Confusing.

Consider a dataset has two classes say Class A and B. There may be two cases where your dataset is **Balanced **and **Imbalanced**. Balanced dataset means that, records for class A and B are balanced. Say Class A has 50% of data and class B has 50% of data or 55–45% of data. Imbalanced dataset has records of 90–10% of Class A and B or 80–20 and 70–30% of data.

Metrics to consider will be different for both Balanced and Imbalanced dataset.

Confusion Matrix comes with rows and columns of Actual and Predicted. The terminologies used are True Positive, True Negative, False positive, False Negative.

Lets split the words as True and positive separately.

Positive : Class A ; Negative : Not a Class A(Class B)

True : Predicted is right ; False : Predicted is wrong

Image from Google.

**True Positive** : **_Positive _**: Model predicted as Class A, **_True _**what model predicted is correct. **Concludes as** : Actual is Class A, Model Predicted as Class A.

**True Negative** : **_Negative _**: Model predicted as Class B, **_True _**what model predicted is correct.

#sklearn-metrics #confusion-matrix #metrics #precision-recall #imbalanced-data #data analytic

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**Confusion Matrix** is a matrix that illustrates the **performance** of a classification model when exposed to unseen data. This matrix helps us to identify how the model is performing on test set. From this matrix, many other scores are calculated such as Accuracy, Recall, Precision, F1-score, etc. It is important one should know where to use which type of score as it depends on the application.

There are two classes: Class 1 and Class 2

Class 1:Positive

Class 2: Negative

**Positive**: Observation is True (eg. Picture is a dog)

**Negative**: Observation is False (eg. Picture is not a dog)

**T.P.**(True Positive): Truth and Prediction both are Positive

**T.N.**(True Negative): Truth and Prediction both are Negative

**F.P.**(False Positive): Truth is Negative but Prediction is Positive

**F.N.**(False Negative): Truth is Positive but Prediction is Negative

Accuracy is the ratio of sum of True Positive(T.P.) and True Negative(T.N.) to the sum of the matrix elements.

Precision is defined as the ratio of True Positive(T.P) to the sum of True Positive(T.P) and False Positive(F.P)

Recall is defined as the ratio of True Positive(T.P) to the sum of True Positive(T.P) and False Negative(F.N)

_High recall, low precision: _This means that most of the positive examples are correctly recognized (low FN) but there are a lot of false positives.

_Low recall, high precision: _This shows that we miss a lot of positive examples (high FN) but those we predict as positive are indeed positive (low FP)

Since we have two measures (Precision and Recall) it helps to have a measurement that represents both of them. We calculate an F-measure which uses Harmonic Mean in place of Arithmetic Mean as it punishes the extreme values more

#artificial-intelligence #python #confusion-matrix #machine-learning #data-science

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Who is the target audience?

Educators/ Heads of Schools/ Researchers

**Basic knowledge**

Basic Requirement :

ICT Expertise

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