Remove observable monitoring

Author: Yue-Zhengyuan

src/algorithms/time_evolution/simpleupdate.jl

@@ -245,8 +245,7 @@ end
 
 function MPSKit.time_evolve(
         it::TimeEvolver{<:SimpleUpdate}, H::LocalOperator;
-        tol::Float64 = 1.0e-8, check_interval::Int = 500,
-        observables::Vector{<:LocalOperator} = LocalOperator[]
+        tol::Float64 = 1.0e-8, check_interval::Int = 500
     )
     time_start = time()
     @info "--- Time evolution (simple update), dt = $(it.dt) ---"
@@ -268,10 +267,6 @@ function MPSKit.time_evolve(
                 "SU iter %-7d: E ≈ %.5f, |Δλ| = %.3e. Time = %.3f s/it",
                 iter, real(energy), diff, time1 - time0
             )
-            if !isempty(observables)
-                expvals = [expectation_value(psi, obs, ctmenv) for obs in observables]
-                @info "Observables ≈ $(expvals)."
-            end
         end
         if (iter == it.nstep) && (diff >= tol)
             @warn "SU: bond weights have not converged."

test/timeevol/cluster_projectors.jl

@@ -117,17 +117,14 @@ end
     end
     wts0 = SUWeight(peps0)
     ham = hubbard_model(Float64, Trivial, U1Irrep, InfiniteSquare(Nr, Nc); t = 1.0, U = 6.0, mu = 3.0)
-    observables = [
-        LocalOperator(physicalspace(ham), [(1, 1)] => e_number(Float64, Trivial, U1Irrep)),
-    ]
     # applying 2-site gates decomposed to MPO or not,
     # resulting energy should be almost the same
     e_sites = map((true, false)) do force_mpo
         peps, wts = deepcopy(peps0), deepcopy(wts0)
         trunc = truncerror(; atol = 1.0e-10) & truncrank(4)
         alg = SimpleUpdate(; trunc, force_mpo)
         evolver = TimeEvolver(peps, ham, 0.01, 10000, alg, wts)
-        peps, wts, = time_evolve(evolver, ham; tol = 1.0e-6, observables, check_interval = 1000)
+        peps, wts, = time_evolve(evolver, ham; tol = 1.0e-6, check_interval = 1000)
         normalize!.(peps.A, Inf)
         env = CTMRGEnv(wts)
         for trunc in truncs_env