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10 minutes to Towhee CMD

The Towhee command line tool provides some Towhee Hub related actions, and can also help you set up your Operators, you can learn more about it. The following shows you the common examples of Towhee CMD, so that you can quickly understand.

Manage your account

First, you can create an account on the towhee hub website, then you can log in so that you can use this account to do actions such as creating and pushing repositories locally.

Login your account

As shown in the command line below, you need to provide your account name and password. Here is an example with the towhee account.

$ towhee login
Username: towhee
Successfully logged in.

Check out who is logged in

$ towhee whoami
Username: towhee

Logout your account

If you don't need to log out, please skip this action.

$ towhee logout

If you want to switch to another account on Mac, in addition to running $towhee logout, you also need to remove towhee's keychain access.

The step-by-step operation is to press command + space bar to search for keychain, then open this application, and find in the search box, finally delete if there is a record.

Create operator and develop

Here to create and develop an Operator, such as test-add. Not only can you create the operator in the hub with your account, but you can also create it locally.

Create operator in hub

The following commands will create test-add Operator in the hub and initialize the file structure based on the operator name.

  • -t means the type of Operator, which is divided into “pyop” and “nnop”, “pyop” is the operator of the python function, "nnop" is the operator of the neural network, and the test-add op belongs to the "pyop".

  • -d specifies the directory to save the repository file, defaults to ".", we specify test directory.

  • test-add is the name of the operator.

$ towhee create -t pyop -d test test-add
creating repo with username: towhee, and repo name: test-add

Successfully create Operator in hub:<your-account>/test-add

Initializing the repo file structure...

If you just want to create the operator in the Towhee hub without initializing the file, you can run the above command with --plain argument, e.g. towhee create-op -t pyop -d test test-add --plain.

Create operator locally

If you only want to develop locally without creating the Operator on the Towhee hub, you can run with the --local argument, and it will not require your Towhee account.

$ towhee create -t pyop -d test test-add --local

Initializing the repo file structure...

Develop your code

After initializing the operator file, you will see the following files:,, requirements.txt, which are required by the Towhee operator, and more details in "How to develop my first Operator"(TBD). Then modify the code in as follows:

from towhee.operator import PyOperator, SharedType

class TestAdd(PyOperator):
Simple addition.

factor (`int`):
This argument is summand.
def __init__(self, factor: int):
self._factor = factor

def __call__(self, num: int):
Add num and factor.

num (`int`):
This argument is added.

The sum of two numbers.
result = self._factor + num
return result

def shared_type(self):
return SharedType.Shareable

def input_schema(self):
return [(int, (1,))]

def output_schema(self):
return [(int, (1,))]

Here are some developer notes:

  • Modify __init__ and __call__ functions in the <repo_name> python file(, note that please update the Docstring. For the DataType and DataShape of the input and output schema, please refer to the following format:

    int(1, )
    str(1, )
    float(1, )
    ImageShape of image
    AudioFrame(1024, )
    ImageFrameShape of image
    Numpy type: np.float, np.int32 ...Shape of numpy
  • Update requirements.txt.

  • Please update if you want to publish your operator.

Setup your operator and test

Once you've developed your operator, you'll definitely want to test it. The next step is to set up your operator and test it. The setup is divided into two modes: develop and install. The install mode is usually used to setup operators that will not be modified/debugged, and develop mode is used to develop code and have the changes take effect immediately.

Setup with develop mode

  • -p specifies the directory to the operator file, defaults to ".", and its directory contains <operator_name>.py,, and requirements.txt.

  • --develop means the setup mode is develop.

$ towhee install -n towhee -p test/test-add --develop

If you want to setup your operator with install mode, you can run with $ towhee install -n towhee -p test/test-add.

Test your operator

Then you can run towhee.ops to test this operator.

$ python
>>> from towhee import ops
>>> op = ops.towhee.test_add(factor=1)
>>> op(1)

And you can also run with towhee.dc:

>>> import towhee
>>> towhee.dc([1,3]).towhee.test_add(factor=1).to_list()
[2, 4]