Solve Typeerror: type numpy.ndarray doesnt define round method

The Typeerror: type numpy.ndarray doesnt define round method occurs when we tried to apply the round method on ndarray. We think that the round is built-in method and it shouldn’t give any error when we apply the round method on ndarray. In this short article, we will learn how we can solve Typeerror: type numpy.ndarray doesnt define round method error using various methods. Moreover, we will also discuss how to understand errors in Python.

Solve Typeerror: type numpy.ndarray doesnt define round method in Python

Sometimes we might have to use the round method to round the ndarray which does not have such a built-in method. In such case, we get Typeerror: type numpy.ndarray doesnt define round method error: For example, one example could be:

import numpy

......

# Prediction
predictions = model.predict(X_test)
# round predictions
rounded = [round(x) for x in predictions]
print(rounded)

Output:

  File "/home/abigail/workspace/ml/src/network.py", line 41, in <listcomp>
    rounded = [round(x) for x in predictions]
TypeError: type numpy.ndarray doesn't define __round__ method

So, now how to solve such an error? The error might be look complete, but it is very easy to solve.

Let us go through some of the possible solutions:

Possible solutions

Now let us go through possible solutions to solve Typeerror: type numpy.ndarray doesnt define round method issue.

One possible solution is that we are trying to apply the round method to numpy.array which it is not supporting. So, what we can do is use numpy.round instead as shown below:

rounded = [numpy.round(x) for x in predictions]

We can also use the following as an alternative method. It will also help us to get rid of the problem:

rounded = [round(y) for y in x for x in predictions]

Lastly here is another solution that you can use in order to get rid of Typeerror: type numpy.ndarray doesnt define round method error:

rounded = [float(numpy.round(x)) for x in predictions]

These three methods should help you to get rid of the error:

Understanding the error deeply

If you are still facing the error and the above-mentioned methods couldn’t help you to solve the problem, then you can continue reading this section.

Here we will deeply analyze the problem and understand it fully.

In Python, the errors tell a lot of information. Usually, the errors in Python have two major parts. The first part tells the category of the error which in this case is TypeError. The second part gives more specific details about the error and explains why we are getting the error. For example in this case the error explicitly says that we are trying to perform the round method on ndarrays which is not allowed.

What is TypeError in Python?

TypeError is one among the several standard Python exceptions. TypeError is raised whenever an operation is performed on an incorrect/unsupported object type. For example, using the + (addition) operator on a string and an integer value will raise TypeError

# variales
string = "Bashir"
floating = 43.32

# addition
string + floating

This will return TypeError because we are trying to add two different data-typed variables which are not allowed in Python.

How to solve TypeError in Python?

There can be many possible ways to solve TypeError in Python. One of the simplest ways is to use the type() method to ding the data type of the variable and use correct data types. For example, a string cannot be multiplied by a float but it can be multiplied by an integer value. You can check the data type of the variable using the type() method:

Another method to solve the TypeError is to use the try-except block in Python. The try-except blocks in Python are used to handle any kind of error.

What is ndarray in Python?

An ndarray is a (usually fixed-size) multidimensional container of items of the same type and size. The number of dimensions and items in an array is defined by its shape, which is a tuple of N non-negative integers that specify the sizes of each dimension

Summary

In this short article, we discussed how we can solve TypeError: type numpy.ndarray doesn’t define round method error using various methods. Mainly, we came across three different methods to solve the error. The main cause of the error is when we try to use the round method on ndarray which does not support such method.

Frequently Asked Questions

Why am I getting type numpy.ndarray doesnt define round method error?

The main reason for getting this error is because you are using round method on ndarray in Python which does not support such method.

How can I solve Typeerror: type numpy.ndarray doesnt define round method error?

The simplest method to solve the error is to use the round method not directly but from the numpy array as we have solved in this article.

What does TypeError mean in numpy.ndarray?

The TypeError in this case means we are trying to perform some operation on ndarray that is not supported by it.

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