reduction operation ‘argmax’ not allowed for this dtype

Are you having trouble solving the typeerror: reduction operation ‘argmax’ not allowed for this dtype?

Comprehending this error is the best first step to solving it quickly.

We will understand and learn how to fix this error in this article.

To start with, what is this error, and why does it occur?

What is typeerror: reduction operation ‘argmax’ not allowed for this dtype?

The typeerror: reduction operation ‘argmax’ not allowed for this dtype is an error message in Python.

Attempting to execute the argmax operation on an array with a data type that does not support it can trigger this error.

Examples of data types that do not support the argmax operation:

✅ string
✅ boolean

What is argmax?

In Python, argmax is an operation that is used to discover the indices of the maximum values in an array.

However, it is only allowed for particular data types, such as:

✅ Floating point numbers
✅ Integers

This just means that if we try to execute it on an array with a data type of string or boolean, this error will arise.

Typeerror: reduction operation ‘argmax’ not allowed for this dtype – SOLUTION

Time needed: 2 minutes

To fix the typeerror: reduction operation ‘argmax’ not allowed for this dtype, here is the guide you can follow:

  1. Check your array’s data type.


    To check your array’s data type, use the dtype attribute.

    If it is confirmed that the data type of your array does not support the argmax operation, modify it.

  2. Convert the data type.


    To convert the data type into one that supports the argmax operation, use the astype() method.

    Example:

    Convert a string array into a numeric array.

    Note: Numeric arrays support the argmax operation.

  3. Utilize a different operation.


    If, in any case, converting the data type of your array is not possible, try using a different operation.

    This time, use an operation that is supported by the data type.

    Example:

    Use the max() function to discover the maximum value in a string array.

Here is a sample code that fixes this error:

import numpy as np

arr = np.array(['1', '2', '3'])
print(arr.dtype)

c_arr = arr.astype(int)
print(c_arr.dtype)

max_index = np.argmax(c_arr)
print(max_index)

In this example, the first thing we did was import numpy.

Then, we created a string array and checked its data type.

Next, we converted the data type into an integer and also checked its data type.

Lastly, we performed the argmax operation.

Output:

<U1
int32
2

See also: Typeerror: class constructor mongostore cannot be invoked without new

Tips to avoid getting Typeerrors

The following are some tips to avoid getting type errors in Python.

  • Avoid using the built-in data types in Python in the wrong way.

    → Be sure that your variables and data structures are using the correct data types.
  • Always check or confirm the types of your variables.

    → To check the types of your variables, use the type() function.

    This will allow you to confirm if the type of your variable is appropriate.
  • Be clear and concise when writing code.

    → Being clear and concise when writing your code can help you avoid typeerrors.

    It is because it will become easier to understand.
  • Handle the error by using try-except blocks.

    → Try using the try-except blocks to catch and handle any typeerror.
  • Use the built-in functions of Python if needed.

    → Use built-in functions such as int()str(), etc. if you need to convert a variable to a different type.

FAQs

🗨 What is TypeError?


Typeerror is an error in Python that arises when an operation or function is applied to a value of an improper type.

This error indicates that the data type of an object isn’t compatible with the operation or function being used.

🗨 What is Python?


Python is one of the most popular programming languages.

It is used for developing a wide range of applications.

In addition, Python is a high-level programming language that is used by most developers due to its flexibility.

Conclusion

In conclusion, the typeerror: reduction operation ‘argmax’ not allowed for this dtype is an error that appears in Python.

You can solve this error quickly by either converting the data type into one that supports the argmax operation or by using a different operation.

By following the guide above, you will surely solve this error quickly.

That is all for this tutorial, IT source coders!

We hope you have learned a lot from this. Have fun coding!

Thank you for reading! 😊