'Tensor' object has no attribute 'ref'

[alecjervis1]

Hello, When I try and run a file that uses 'dde.grad.hessian' I receive an error saying the following: 'Tensor' object has no attribute 'ref'. I am quite new to all of this and so it is probably quite a straight forward issue but any help would be more than welcome. Thanks in advance, Alec

[lululxvi]

Is your tf version >=2.2?

[alecjervis1]

Hello, thank you for your response - this was indeed the solution to the issue.

I am trying to create a heat transfer model on a square geometry with: a constant temperature on one side and also a tube running through the centre removing heat at a constant rate. I am having further problems that I wondered if you could assist me with please; namely:

• I am getting very large train losses on my boundary conditions (of positive orders of magnitude)
• If I use just "model.compile("adam".. " I receive an error saying 'ValueError: No epochs for adam.' - I feel this might be linked to the first issue?
• The plot often shows the function falling off in the corners of the domain (but often quite drastically in one corner)

This following plot was found by altering the alpha2 value to 100 and changing the side of constant temperature:

Again, thank you in advance for any responses!

Also if anyone could point me in the direction of any good sources to gain a deeper understanding it would be very helpful!

Thank you, Alec

[lululxvi]

• Is boundaryinner correct? The center of the inner disk is (15, 15), right?
• Is this problem well defined if you only the temperature on one side?
• The scale of the problem is not good. See FAQ "Q: I failed to train the network or get the right solution, e.g., the training loss is large." about scaling

[DSJ414]

你的 tf 版本是否>=2.2？

我的tensorflow版本是1.15，deepxde版本是0.9.0，也碰到的这样的问题，应该怎么解决呢？