2

I have a passive voice as follows:

The algorithm is naturally designed for texture classification.

It is a passive voice. Could I rewrite the above sentence in active voice?

3

In order to rewrite the sentence in the active voice, you need a subject, such as the name of the researcher(s) or developer(s) who developed the algorithm, or something vaguer, such as "Researchers". This would result in something like:

  • [Professor] John Doe designed the algorithm for texture classification.
  • Researchers designed the algorithm for texture classification.

Two issues become apparent in this type of paraphrase:

  • Is/are the designer/designers of the algorithm so important in the context of your text that they need to be mentioned?
  • How do you reword "naturally" so it makes sense in an active sentence? In order to know this, it would be good to know why the algorithm is claimed to be "naturally designed" for its purpose.

Making a few assumptions about "naturally", the following paraphrases are possible:

  • [Professor] John Doe designed the algorithm specifically for the purpose of texture classification.
  • [Professor] John Doe designed the algorithm so it would be a good fit for texture classification.

Other paraphrases would be possible, depending on the intent of "naturally".

However, I would like to point out that the passive voice does not need to be avoided at all costs. Depending on the context, the original sentence may be a better choice than one that uses the active voice. This article from Biomedical Editor describes a few situations when the passive voice is the better choice.

  • Great job. Thank you. If I do not know the object (Prof). Can I use the name of an algorithm? For example, the K-means algorithm specifically designed for the purpose of texture classification. – Jame Sep 20 '16 at 8:47
  • 1
    @user8430 If you want to mention the algorithm, the result would be: "The K-means algorithm is/was specifically designed for the purpose of texture classification." (K-means has a long history.) – user800 Sep 20 '16 at 8:59

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