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# Copyright (c) MONAI Consortium
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
# http://www.apache.org/licenses/LICENSE-2.0
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
import monai
import torch
def compute_scale_factor(autoencoder, train_loader, device):
with torch.no_grad():
check_data = monai.utils.first(train_loader)
z = autoencoder.encode_stage_2_inputs(check_data["image"].to(device))
scale_factor = 1 / torch.std(z)
return scale_factor.item()
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