return theano.grad(loss_or_grads, params)cost must be a scalar.
时间: 2024-05-31 13:14:22 浏览: 12
The `theano.grad()` function expects the first argument `loss_or_grads` to be a scalar, which represents the cost that we are trying to minimize with respect to the model parameters specified in the second argument `params`.
If you are getting the error message "cost must be a scalar", it means that the `loss_or_grads` variable that you passed to `theano.grad()` is not a scalar, but instead is a vector or a tensor. To resolve this error, make sure that the `loss_or_grads` variable is a scalar value.
One common reason for this error is that the loss function you defined is returning a vector or tensor instead of a scalar. In this case, you need to modify your loss function so that it returns a scalar value. Alternatively, you can take the sum or mean of the loss function output to obtain a scalar value to pass to `theano.grad()`.
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