使用 for 循环制作具有多个键的字典

Question

I have a dictionary of metric names.

metrics = {
    'accuracy': accuracy,
    'loss': loss
}

I want to create another dictionary that stores the values of the metrics for a set of hierarchical labels. The dictionary is supposed to be something like this:

{'c1_accuracy': 0.84, 'c1_loss': 5.67, 'c2_loss': 8.78, 'c2_accuracy': 0.73}

I am trying to use something like this

summary_batch = {'c1_{}'.format(metric): metrics['metric'](c1_output, c1_label) for metric in metrics}

How can I do it for all the labels (c1, c2, ...) at once?

Edit: I am trying to solve a hierarchical classification problem where I have two coarse classes (let's say c1 and c2) and one fine class (f). metrics dictionary is just used to store the metrics which are used in the training and evaluation loops. I have separate functions for calculating the metric values. In the above example, metrics['metric'](c1_output, c1_label) for metric in metrics will call the accuracy and loss functions for the true labels ( c1_label ) and model output ( c1_output ).

I want to store these metrics for both coarse classes and the fine class. Is there a way I can do that without using add or writing separate loops for each class?

Answer 1

It would be interesting to know how you obtain the values to fill the dictionary in order to do it while creating it, however, you can create it empty with this loop

metrics = {}

for n in range(10):
    key_constructor = 'c{}_{}'
    key_acc = key_constructor.format(n,'accuracy')
    key_loss = key_constructor.format(n,'loss')
    metrics[key_acc] = 0
    metrics[key_loss] = 0

Answer 2

If you want to have a hierarchy why not using a nested dict?

summuary_batch = {
    "c1": {
        "accuracy": xxx,
        "loss": yyy,
    },
    "c2": {
        "accuracy": zzz,
        "loss": ttt,
    },
}