Course 4, week 4 Neural Style Transfer: train_step "Unexpected cost for epoch 0"

Course Q&A Deep Learning Specialization Convolutional Neural Networks
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I just read over this whole thread and noticed that we didn’t really conclusively explain why it doesn’t work with tf.square but it does work with **2. There is one post on this thread that actually does describe the error here, but it’s worth also pointing to this other thread which gives a demonstration of the difference.

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