Using "write_when_maxdim_exceeds" in ITensorTDVP raises error

kwang0 · June 6, 2023, 8:33pm

I am trying to implement tdvp on the gpu using ITensorGPU and have seen really good speedups, but I am running into memory issues. I wanted to use the “write_when_maxdim_exceeds” argument to write to disk, but now I am getting an error message “LoadError: UndefVarError: disk not defined”. This happens when I add the argument to the tdvp call in the code provided in the examples folder too:

github.com

ITensor/ITensorTDVP.jl/blob/b127e8c17e21b4a27bce163ac122e27a5278675d/examples/01_tdvp.jl

using ITensors
using ITensorTDVP

n = 10
s = siteinds("S=1/2", n)

function heisenberg(n)
  os = OpSum()
  for j in 1:(n - 1)
    os += 0.5, "S+", j, "S-", j + 1
    os += 0.5, "S-", j, "S+", j + 1
    os += "Sz", j, "Sz", j + 1
  end
  return os
end

H = MPO(heisenberg(n), s)
ψ = randomMPS(s, "↑"; linkdims=10)

@show inner(ψ', H, ψ) / inner(ψ, ψ)

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Using "write_when_maxdim_exceeds" in ITensorTDVP raises error

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