Experiment Report: burgers (dlga)

Metadata

Algorithmdlga
Datasetburgers
Expression\( u_{t} = - 0.9993 u u_{x} + 0.0999 u_{xx} \)
Best DLGA fitness0.00346122
R²0.999539
NMSE0.0004612
Iterations40
Early StoppedFalse
config.algorithmdlga
config.modeconstant
config.library['u', 'u_x', 'u_xx', 'u_xxx']
config.solversvd_null_space
config.lhs_auto_selectFalse
config.target_lhs_order1
config.epsilon0.001
config.pop_size40
config.seed1
config.auto_upgrade_threshold0.001
config.max_modules5
config.max_module_length5
config.partial_prob0.6
config.genes_prob0.6
config.crossover_rate0.8
config.mutation_rate0.4
config.add_rate0.4
config.delete_rate0.5
config.surrogate_hidden_sizes[50, 50, 50, 50, 50]
config.surrogate_activationsin
config.surrogate_lr0.001
config.surrogate_max_epochs50000
config.surrogate_patienceNone
config.surrogate_val_ratio0.2
config.surrogate_restore_bestTrue
config.provider_kindautograd

Equation Card

Equation Card

Read the published equation, compare its term coefficients with ground truth when available, and check the native search-fit NMSE.

Convergence

Convergence

Read the best native score reached at each search iteration.

Term Presence

Term Presence

Track active fitted terms among the recorded top-k distinct structures. Targets remain separate; gray columns have no eligible candidates.

Search Score Distribution

Search Score Distribution

Read the median, interquartile range and min-max native scores of the best representatives of the selected distinct structures. These bands describe the top-k selection, not the entire population.

Parity

Parity

Compare predicted and observed targets against the diagonal of exact agreement.

Equation

Equation

Read the published equation with its fitted coefficients and active terms.

Equation Tree

Equation Tree

Read the operators and derivatives that compose the published equation.

Residual

Residual

Read the distribution and spatial pattern of predicted minus observed target values.

Coefficient Bar

Coefficient Bar

Compare the magnitudes and signs of the active fitted coefficients.

Field Comparison

Field Comparison

Compare the measured field with forward integration of the discovered equation and their difference.

Pde Residual Field

Pde Residual Field

Compare the fitted derivative target with the equation prediction and their residual, without forward integration.

Time Slices

Time Slices

Compare measured and integrated fields at the labeled observation times.

Error Heatmap

Error Heatmap

Locate the signed field error from forward integration at the labeled physical coordinates.

Plugin Plots

Fitness Spread

Fitness Spread

Per-generation MEAN GA fitness (NMSE + epsilon*length; lower is better) over valid individuals, on a LOG y-axis: single blown-up individuals (svd_null_space normalization) push the mean into the thousands and a linear axis flattens the range the search actually works in. Complements the platform 'convergence' plot, which draws the single global best (the GA keeps its best genome, so the per-generation best is that same curve). A generation appears as a gap whenever its mean is non-finite — one inf-fitness individual suffices, not only all-invalid generations.

Population Diversity

Population Diversity

Distinct candidate-expression count per generation over the whole population. A collapsing count signals premature convergence.

Complexity Evolution

Complexity Evolution

Mean retained-term count (EvaluationResult.complexity — terms kept in the final fitted equation) of valid individuals per generation. NOT the genome gene count that the epsilon fitness penalty acts on: module-internal bloat (more genes per term) moves the penalty but not this curve. All-invalid generations appear as gaps (nothing was measured).

Surrogate Training Curve

Surrogate Training Curve

NN_1 surrogate (Xu 2020 §2.2.1) training loss vs epoch (log-y): train and — when a validation split exists — validation MSE, with the best-validation epoch marked. This is the 'deep learning' evidence of the DLGA pipeline — the autograd-derivative source the GA reads from. Absent (No data panel) when the surrogate was pre-trained or not trained by the platform builder.

Warnings

Showing 40 of 83 terms; 43 omitted from this figure.
Integration boundary on 'x': periodic.
Domain note: this run fitted derivatives in an autograd / NN-smoothed domain. Forward time integration necessarily applies finite-difference spatial derivatives to the evolved states (the same D-007 stencils as the data pipeline; no autograd surrogate exists for integrator states). Integrating autograd-fitted coefficients with finite-difference derivatives is an inherent approximation of this plot: final_eval (fit quality in the autograd domain) and field-comparison metrics (physical recovery in the finite-difference domain) measure different things and may disagree on noisy data. This is expected, not a discovery error.
Full result (JSON, for debugging) — click to expand
{
  "result_schema_version": 1,
  "best_expression": "add(mul(u, u_x), u_xx)",
  "best_score": 0.0034612187302319247,
  "iterations": 40,
  "early_stopped": false,
  "final_eval": {
    "mse": 3.145766375617651e-06,
    "nmse": 0.00046121873023192473,
    "r2": 0.999538781269768,
    "score": 0.0034612187302319247,
    "complexity": 2,
    "coefficients": [
      -0.9993157889584017,
      0.09990418122526246
    ],
    "is_valid": true,
    "error_message": "",
    "invalid_reason": null,
    "selected_indices": [
      0,
      1
    ],
    "residuals": "[51456 elements]",
    "terms": [
      "mul(u, u_x)",
      "u_xx"
    ],
    "expression": "add(mul(u, u_x), u_xx)",
    "lhs_name": "u_t",
    "condition_number": null,
    "condition_number_computed": false
  },
  "actual": "[51456 elements]",
  "predicted": "[51456 elements]",
  "dataset_name": "burgers",
  "algorithm_name": "DLGAPlugin",
  "config": {
    "algorithm": "dlga",
    "mode": "constant",
    "library": [
      "u",
      "u_x",
      "u_xx",
      "u_xxx"
    ],
    "solver": "svd_null_space",
    "lhs_auto_select": false,
    "target_lhs_order": 1,
    "epsilon": 0.001,
    "pop_size": 40,
    "seed": 1,
    "auto_upgrade_threshold": 0.001,
    "max_modules": 5,
    "max_module_length": 5,
    "partial_prob": 0.6,
    "genes_prob": 0.6,
    "crossover_rate": 0.8,
    "mutation_rate": 0.4,
    "add_rate": 0.4,
    "delete_rate": 0.5,
    "surrogate_hidden_sizes": [
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    ],
    "surrogate_activation": "sin",
    "surrogate_lr": 0.001,
    "surrogate_max_epochs": 50000,
    "surrogate_patience": null,
    "surrogate_val_ratio": 0.2,
    "surrogate_restore_best": true,
    "provider_kind": "autograd"
  },
  "recorder": {
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      35605.81974904345,
      0.9030097577110622,
      72.3225342708822,
      0.897253324622454,
      0.9059611007591301,
      0.8915170106789582,
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      375108.14067040686,
      0.9264168770237999,
      0.8467920809592041,
      1.3097872078874897,
      0.9108038673181849,
      0.912529084444787,
      0.9114722935909096,
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    "gen_best_nmse": [
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      0.0004610323122701866,
      0.0004610323122701866,
      0.0004611964654439504,
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    "n_valid": [
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    "n_unique": [
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      35,
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      32,
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      33,
      31,
      31,
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      30,
      28,
      38,
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      27
    ],
    "gen_mean_complexity": [
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      2.175,
      1.95,
      2.15,
      1.975,
      2.325,
      2.2,
      2.275,
      2.1,
      2.0,
      1.925,
      1.825,
      1.7,
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      2.175,
      2.0,
      1.575,
      2.1,
      1.9,
      2.25,
      2.25,
      2.175,
      2.15,
      1.9,
      1.95,
      1.925,
      2.15,
      2.325,
      2.025,
      1.825,
      2.025,
      1.85,
      1.925,
      1.8,
      1.725,
      2.1,
      2.0,
      1.9,
      1.575,
      1.625
    ],
    "lhs_ut": [
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      40,
      40,
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      40,
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      40
    ],
    "lhs_utt": [
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      0
    ],
    "search_topk_expressions": [
      [
        "add(add(add(mul(u, u_x), mul(mul(u, u_x), u_x)), mul(mul(mul(u, u_x), u_xx), u_xx)), mul(mul(u, u), u_x))",
        "add(add(add(add(u, mul(mul(mul(mul(u, u_x), u_x), u_x), u_xxx)), u_xxx), mul(mul(u, u_x), u_x)), u_x)",
        "add(add(add(add(mul(mul(mul(mul(u_x, u_x), u_xx), u_xx), u_xx), u_x), u_xx), u), mul(mul(mul(mul(u, u), u_x), u_x), u_xxx))",
        "add(add(add(mul(u, u_xx), u), u_xx), mul(mul(mul(mul(u_x, u_x), u_x), u_x), u_x))",
        "u",
        "add(mul(u_x, u_xxx), u)",
        "add(u, mul(mul(mul(u, u_x), u_xxx), u_xxx))",
        "add(mul(mul(mul(u_x, u_xxx), u_xxx), u_xxx), u)",
        "add(u, mul(mul(mul(mul(u, u_x), u_x), u_x), u_xx))",
        "add(mul(mul(mul(mul(u, u), u_x), u_x), u_x), u)"
      ],
      [
        "add(add(mul(mul(mul(mul(u, u_x), u_x), u_x), u_xx), u_xx), mul(u, u_x))",
        "add(add(add(mul(u, u_x), mul(mul(u, u_x), u_x)), mul(mul(mul(u, u_x), u_xx), u_xx)), mul(mul(u, u), u_x))",
        "add(u_xxx, mul(u, u_x))",
        "add(add(add(add(mul(mul(mul(mul(u_x, u_x), u_xx), u_xx), u_xx), u_x), u_xx), u), mul(mul(mul(mul(u, u), u_x), u_x), u_xxx))",
        "add(add(add(add(mul(u, u_xx), u), u_xx), mul(mul(mul(mul(u_x, u_x), u_x), u_x), u_x)), u_x)",
        "add(add(mul(u_x, u_xx), u), u_xxx)",
        "u",
        "add(mul(u_x, u_xxx), u)",
        "add(u, mul(mul(u, u), u_x))",
        "add(mul(mul(mul(mul(u_x, u_x), u_xx), u_xxx), u_xxx), u)"
      ],
      [
        "add(add(mul(mul(mul(mul(u, u_x), u_x), u_x), u_xx), u_xx), mul(u, u_x))",
        "add(add(add(add(mul(u, u_x), u_x), u_xxx), u), mul(mul(mul(mul(u, u), u_x), u_x), u_xxx))",
        "add(mul(u, u_x), mul(mul(mul(u, u), u), u_xxx))",
        "add(add(mul(u, u_x), u_xxx), mul(mul(u, u), u_x))",
        "add(u, u_xx)",
        "add(add(add(mul(u, u_xx), u), u_xx), u_x)",
        "add(add(add(mul(u_x, u_xxx), u_xx), mul(mul(mul(u, u_xx), u_xxx), u_xxx)), u)",
        "u",
        "add(u, mul(mul(u, u), u_x))",
        "add(u, mul(mul(mul(u_x, u_xx), u_xxx), u_xxx))"
      ],
      [
        "add(add(mul(mul(mul(mul(u, u_x), u_x), u_x), u_xx), u_xx), mul(u, u_x))",
        "add(add(u, mul(mul(mul(u, u_xx), u_xxx), u_xxx)), mul(u, u_x))",
        "add(add(mul(u, u_x), u_xxx), mul(mul(mul(mul(u, u_x), u_xx), u_xx), u_xxx))",
        "add(add(add(mul(u, u_xx), u), u_xx), u_x)",
        "u",
        "add(mul(mul(u_xx, u_xxx), u_xxx), u)",
        "add(add(add(add(mul(u_x, u_xx), mul(mul(u, u), u_x)), mul(u_xx, u_xxx)), u), u_xxx)",
        "add(mul(mul(mul(u_x, u_xx), u_xxx), u_xxx), u)",
        "add(add(u, mul(u_x, u_xxx)), mul(u_x, u_x))",
        "add(add(add(mul(u_x, u_xxx), u), mul(mul(mul(u, u_xx), u_xxx), u_xxx)), mul(mul(u, u_x), u_xx))"
      ],
      [
        "add(add(add(mul(u, u_xx), u_xx), mul(u, u_x)), u_x)",
        "add(add(mul(mul(mul(mul(u, u_x), u_x), u_x), u_xx), u_xx), mul(u, u_x))",
        "add(add(add(mul(u, u_x), mul(mul(mul(mul(u, u), u_xx), u_xxx), u_xxx)), u_x), mul(u_xx, u_xxx))",
        "mul(u, u_x)",
        "add(add(mul(mul(mul(u, u_x), u_xx), u_xxx), u_xxx), mul(u, u_x))",
        "add(add(mul(mul(mul(u_x, u_xx), u_xxx), u_xxx), u), u_xx)",
        "add(add(add(mul(mul(u_x, u_x), u_x), u), u_xx), u_x)",
        "u",
        "add(mul(mul(u, u), u_x), u)",
        "add(add(u, mul(u_x, u_xxx)), mul(u_x, u_x))"
      ],
      [
        "add(add(u, mul(u, u_x)), u_xx)",
        "add(add(add(mul(u, u_xx), u_xx), mul(u, u_x)), u_x)",
        "add(add(add(mul(u, u_x), mul(mul(mul(mul(u, u), u_xx), u_xxx), u_xxx)), u_x), u_xxx)",
        "add(add(add(add(mul(u, u_xx), mul(mul(u_x, u_xx), u_xxx)), mul(u, u_x)), mul(mul(mul(mul(u_x, u_x), u_x), u_xx), u_xxx)), mul(mul(mul(u, u_x), u_xx), u_xxx))",
        "mul(u, u_x)",
        "add(add(add(add(u, mul(mul(mul(mul(u, u), u), u_x), u_xxx)), mul(mul(u, u_x), u_x)), mul(u_xx, u_xxx)), mul(mul(mul(u, u_x), u_xx), u_xxx))",
        "add(u, mul(u, u_xxx))",
        "u",
        "add(add(u, mul(mul(mul(u, u_xx), u_xxx), u_xxx)), mul(u_x, u_xx))",
        "add(mul(mul(mul(u, u_x), u_x), u_xxx), u)"
      ],
      [
        "add(add(u, mul(u, u_x)), u_xx)",
        "add(add(add(mul(u, u_x), mul(mul(mul(mul(u_x, u_x), u_x), u_xx), u_xxx)), mul(mul(mul(u, u_x), u_xx), u_xxx)), u)",
        "add(u, mul(u, u_x))",
        "u",
        "add(u, mul(mul(mul(mul(u, u_x), u_x), u_xx), u_xxx))",
        "add(add(mul(mul(u, u_x), u_xxx), u), mul(mul(mul(mul(u, u), u_x), u_x), u_xxx))",
        "add(add(add(u, u_xxx), mul(mul(mul(u, u_x), u_x), u_xx)), mul(mul(u_x, u_xx), u_xx))",
        "add(add(add(mul(mul(mul(mul(u, u_x), u_x), u_xx), u_xx), mul(mul(mul(u, u_xx), u_xx), u_xxx)), u), u_x)",
        "add(add(add(add(mul(u_x, u_x), mul(mul(u_xx, u_xxx), u_xxx)), mul(mul(mul(u_x, u_xx), u_xx), u_xx)), u), u_xxx)",
        "add(add(add(add(u, mul(mul(mul(u, u_xx), u_xxx), u_xxx)), mul(mul(u, u_x), u_xx)), mul(u_xxx, u_xxx)), mul(u_xx, u_xxx))"
      ],
      [
        "add(add(u, mul(u, u_x)), u_xx)",
        "add(add(add(mul(mul(mul(mul(u, u_x), u_x), u_xx), u_xx), mul(mul(mul(u, u_xx), u_xx), u_xxx)), u), mul(u, u_x))",
        "add(add(mul(u, u_x), mul(mul(mul(mul(u_x, u_x), u_x), u_xx), u_xxx)), mul(mul(mul(u, u_x), u_xx), u_xxx))",
        "add(u, mul(mul(u, u_x), u_x))",
        "add(add(mul(mul(u, u_xx), u_xxx), u), u_xx)",
        "u",
        "add(u, mul(mul(u_x, u_x), u_xx))",
        "add(mul(u_xx, u_xxx), u)",
        "add(add(mul(mul(u, u_x), u_xxx), u), u_xxx)",
        "add(add(mul(mul(u, u_x), u_xxx), u), mul(mul(mul(u_x, u_x), u_xxx), u_xxx))"
      ],
      [
        "add(add(u, mul(u, u_x)), u_xx)",
        "add(add(add(mul(mul(mul(mul(u, u_x), u_x), u_xx), u_xx), mul(mul(mul(u, u_xx), u_xx), u_xxx)), u_x), mul(u, u_x))",
        "add(add(mul(mul(u, u_xx), u_xxx), u), u_xx)",
        "u",
        "add(u_xxx, u)",
        "add(mul(u_xx, u_xxx), u)",
        "add(add(mul(u_x, u_xx), mul(mul(mul(mul(u_x, u_x), u_x), u_xx), u_xxx)), u)",
        "add(mul(mul(u, u_x), u_xxx), u)",
        "add(add(mul(u, u_xx), mul(u_xx, u_xxx)), u)",
        "add(u, mul(mul(mul(u, u_x), u_x), u_xxx))"
      ],
      [
        "add(add(u, mul(u, u_x)), u_xx)",
        "add(mul(mul(mul(u_x, u_xx), u_xx), u_xx), mul(u, u_x))",
        "add(add(mul(mul(u, u), u_xx), u), u_x)",
        "u",
        "add(u, mul(u_x, u_xxx))",
        "add(mul(u_xx, u_xx), u)",
        "add(mul(mul(u, u_xx), u_xxx), u)",
        "add(add(mul(mul(mul(mul(u, u_x), u_x), u_xx), u_xxx), u), u_x)",
        "add(add(mul(mul(u, u_x), u_xxx), mul(mul(mul(mul(u_x, u_x), u_x), u_xx), u_xxx)), u)",
        "add(add(add(add(mul(u_x, u_x), mul(mul(u_xx, u_xxx), u_xxx)), mul(mul(u_xx, u_xx), u_xx)), u), u_xxx)"
      ],
      [
        "add(add(u, mul(u, u_x)), u_xx)",
        "add(add(add(add(mul(u, u_x), mul(mul(u_xx, u_xxx), u_xxx)), mul(mul(u_xx, u_xx), u_xx)), u), u_xxx)",
        "add(u, mul(u, u_xxx))",
        "u",
        "add(add(add(add(mul(mul(mul(u, u_xx), u_xxx), u_xxx), u), mul(mul(mul(u_x, u_xx), u_xx), u_xxx)), mul(mul(mul(u_x, u_x), u_xx), u_xx)), u_xx)",
        "add(add(mul(mul(u, u_x), u_xxx), mul(mul(mul(mul(u_x, u_x), u_xx), u_xx), u_xxx)), u)",
        "mul(mul(u, u), u)",
        "mul(mul(u, u_x), u_x)",
        "u_xx",
        "u_x"
      ],
      [
        "add(add(u, mul(u, u_x)), u_xx)",
        "add(add(add(mul(u, u_x), mul(mul(u_xx, u_xxx), u_xxx)), mul(mul(u_xx, u_xx), u_xx)), u)",
        "mul(u, u_x)",
        "add(mul(u, u_xx), mul(u, u_x))",
        "add(add(add(u_xx, mul(mul(u, u_xx), u_xx)), u_x), u)",
        "add(add(add(mul(mul(mul(u, u_xx), u_xxx), u_xxx), u), mul(mul(mul(u_x, u_xx), u_xx), u_xxx)), u_xx)",
        "u",
        "add(add(add(add(mul(u_xx, u_xxx), u), mul(mul(mul(u, u_x), u_xx), u_xx)), u_xxx), mul(u, u_xx))",
        "add(add(mul(mul(mul(mul(u_x, u_x), u_xx), u_xxx), u_xxx), u), mul(mul(mul(mul(u, u_x), u_xx), u_xxx), u_xxx))",
        "mul(mul(u, u), u)"
      ],
      [
        "add(add(u, mul(u, u_x)), u_xx)",
        "add(add(mul(u, u_x), mul(mul(u_xx, u_xxx), u_xxx)), u)",
        "mul(u, u_x)",
        "add(u_xx, u)",
        "add(add(mul(mul(mul(u, u), u_x), u_xx), u), mul(u_xx, u_xxx))",
        "u",
        "add(add(u_xxx, mul(u_xxx, u_xxx)), u)",
        "add(add(u, mul(mul(mul(u, u_x), u_xx), u_xx)), u_xxx)",
        "add(u, mul(mul(mul(u, u_xx), u_xx), u_xxx))",
        "add(u, mul(mul(mul(mul(u, u_x), u_xx), u_xx), u_xxx))"
      ],
      [
        "add(add(u, mul(u, u_x)), u_xx)",
        "mul(u, u_x)",
        "add(u, u_xx)",
        "add(add(mul(mul(mul(u, u), u_x), u_xx), u), mul(u_xx, u_xx))",
        "u",
        "add(u_xxx, u)",
        "add(mul(mul(u_xx, u_xxx), u_xxx), u)",
        "add(add(u_xxx, u), mul(u, u_xx))",
        "add(add(u, mul(mul(mul(u, u_x), u_xx), u_xx)), u_xxx)",
        "add(mul(mul(mul(u, u_xx), u_xxx), u_xxx), u)"
      ],
      [
        "add(add(u, mul(u, u_x)), u_xx)",
        "add(add(mul(u, u_x), u_xx), mul(mul(mul(u, u_x), u_xxx), u_xxx))",
        "add(add(add(mul(mul(u, u), u_xx), mul(mul(u_x, u_x), u_xx)), u), mul(u, u_xxx))",
        "add(add(mul(u, u_x), mul(u_xx, u_xxx)), mul(u_xx, u_xx))",
        "add(u, u_xx)",
        "add(add(u, mul(u_x, u_xx)), u_x)",
        "u",
        "add(mul(mul(u_x, u_x), u_xx), u)",
        "add(add(u_xxx, u), mul(mul(mul(mul(u, u), u), u_x), u_xxx))",
        "add(add(u, mul(u_xx, u_xxx)), u_xxx)"
      ],
      [
        "add(add(u, mul(u, u_x)), u_xx)",
        "mul(u, u_x)",
        "u",
        "add(u, u_x)",
        "add(u, mul(u_xx, u_xxx))",
        "add(add(mul(mul(u, u_xxx), u_xxx), u), u_xxx)",
        "add(add(u_xxx, u), mul(mul(mul(u, u_x), u_xx), u_xx))",
        "add(add(mul(u_xx, u_xx), mul(mul(u_x, u_x), u_xxx)), u)",
        "add(add(add(add(mul(mul(u_x, u_xxx), u_xxx), mul(u, u_xx)), mul(u, u_xxx)), u), u_xxx)",
        "add(add(u, mul(u_xx, u_xxx)), mul(mul(mul(mul(u, u_x), u_xx), u_xx), u_xxx))"
      ],
      [
        "add(add(u, mul(u, u_x)), u_xx)",
        "add(add(mul(mul(u_x, u_x), u_x), mul(u, u_x)), mul(mul(mul(mul(u, u), u), u), u_xx))",
        "u",
        "add(u, u_xxx)",
        "add(add(mul(mul(u_x, u_xxx), u_xxx), mul(u, u_xx)), u)",
        "add(add(add(add(mul(mul(mul(mul(u_x, u_x), u_x), u_xxx), u_xxx), mul(u_x, u_x)), u), u_xxx), mul(u_xx, u_xxx))",
        "mul(mul(u, u), u)",
        "u_xx",
        "u_xxx",
        "mul(u_xx, u_xxx)"
      ],
      [
        "add(add(u, mul(u, u_x)), u_xx)",
        "add(add(u, mul(u, u_x)), mul(mul(mul(mul(u, u), u), u), u_xx))",
        "add(add(add(add(u_x, mul(u, u_xx)), mul(u, u_x)), mul(mul(mul(mul(u, u), u), u), u_xx)), u_xxx)",
        "add(u_xx, u)",
        "add(add(add(u, u_x), u_xx), mul(mul(mul(u, u_x), u_x), u_xx))",
        "u",
        "add(u_x, u)",
        "add(u_xxx, u)",
        "add(mul(mul(mul(mul(u, u_xx), u_xxx), u_xxx), u_xxx), u)",
        "add(add(add(add(u_xx, mul(u_xx, u_xxx)), u), mul(mul(mul(mul(u_xx, u_xx), u_xx), u_xxx), u_xxx)), mul(mul(u, u_x), u_x))"
      ],
      [
        "add(add(u, mul(u, u_x)), u_xx)",
        "add(add(add(add(u_x, mul(u, u_xx)), mul(u, u_x)), mul(mul(mul(mul(u, u), u), u), u_xx)), u_xxx)",
        "mul(u, u_x)",
        "add(add(u, mul(mul(mul(mul(u, u), u), u), u_xx)), mul(u_x, u_xx))",
        "add(add(add(add(u_xx, u_xxx), u), mul(mul(mul(mul(u_xx, u_xx), u_xx), u_xxx), u_xxx)), mul(mul(u, u_x), u_x))",
        "add(u_xx, u)",
        "add(add(u, u_xx), mul(mul(mul(u, u_x), u_x), u_xx))",
        "add(add(u_xx, u), mul(mul(mul(mul(u_xx, u_xx), u_xxx), u_xxx), u_xxx))",
        "u",
        "add(u, mul(mul(u_x, u_xx), u_xxx))"
      ],
      [
        "add(add(u, mul(u, u_x)), u_xx)",
        "add(add(add(add(mul(mul(mul(u_xx, u_xxx), u_xxx), u_xxx), u_x), u), u_xxx), mul(u, u_x))",
        "add(add(mul(u, u_x), mul(u, u_xx)), mul(mul(mul(mul(u, u), u), u), u_xx))",
        "add(mul(mul(mul(mul(u, u), u), u), u_xx), u)",
        "add(add(u_xx, u_xxx), u)",
        "add(add(add(add(u_xx, u), mul(mul(mul(mul(u_xx, u_xx), u_xx), u_xxx), u_xxx)), mul(mul(u, u_x), u_x)), mul(mul(mul(mul(u, u), u_xx), u_xxx), u_xxx))",
        "add(u, mul(u_x, u_xx))",
        "u",
        "add(u, mul(u_xx, u_xxx))",
        "add(u, mul(mul(u_x, u_xx), u_xxx))"
      ],
      [
        "add(add(u, mul(u, u_x)), u_xx)",
        "add(add(add(mul(u, u_x), u), mul(mul(mul(mul(u, u), u), u), u_xx)), mul(mul(u, u_xx), u_xx))",
        "add(add(add(add(u, mul(u_x, u_xx)), mul(mul(mul(u, u), u), u_x)), mul(mul(u, u_xx), u_xxx)), mul(mul(mul(u, u), u_x), u_xxx))",
        "mul(u, u_x)",
        "add(add(mul(u, u_x), u_x), u_xxx)",
        "add(add(add(mul(mul(u, u), u_x), u), mul(mul(u, u), u)), mul(mul(u, u), u_xx))",
        "add(add(u, mul(u_x, u_xxx)), mul(mul(u, u_x), u_x))",
        "add(add(add(u_xx, u), mul(mul(u, u_x), u_x)), mul(mul(mul(mul(u, u), u_xx), u_xxx), u_xxx))",
        "add(u, mul(u_x, u_xx))",
        "u"
      ],
      [
        "add(add(u, mul(u, u_x)), u_xx)",
        "add(add(add(mul(u_x, u_xx), mul(u, u_x)), mul(mul(u, u_xx), u_xxx)), mul(mul(mul(u, u), u_x), u_xxx))",
        "mul(u, u_x)",
        "add(mul(u, u_x), mul(mul(u_x, u_xx), u_xx))",
        "add(add(add(mul(mul(u, u), u_x), u), mul(mul(u, u), u)), mul(mul(u, u), u_xx))",
        "add(u, u_xx)",
        "u",
        "add(mul(mul(u, u_xx), u_xx), u)",
        "add(u, u_xxx)",
        "add(u, mul(mul(mul(u, u_x), u_xx), u_xx))"
      ],
      [
        "add(add(u, mul(u, u_x)), u_xx)",
        "add(add(add(u, mul(u, u_x)), mul(mul(u, u_xx), u_xxx)), mul(mul(mul(u, u_x), u_x), u_xxx))",
        "mul(u, u_x)",
        "add(mul(u, u_x), mul(mul(u_x, u_xx), u_xx))",
        "add(add(add(mul(mul(u, u), u_x), u), mul(mul(u, u), u)), mul(mul(u, u), u_xx))",
        "add(add(u_xx, u), mul(u_x, u_x))",
        "add(add(add(mul(mul(mul(mul(u, u), u_x), u_xx), u_xxx), u_x), u_xx), u)",
        "u",
        "add(u_x, u)",
        "add(u, u_xxx)"
      ],
      [
        "add(add(u, mul(u, u_x)), u_xx)",
        "add(mul(u, u_x), mul(mul(mul(mul(u, u), u_x), u_x), u_xx))",
        "add(add(add(u, mul(u, u_x)), mul(mul(u, u_xx), u_xxx)), mul(mul(mul(u, u_x), u_x), u_xxx))",
        "add(mul(u, u_xxx), mul(u, u_x))",
        "add(add(u_x, mul(u, u_xx)), mul(u, u_x))",
        "add(add(mul(u_x, u_xxx), mul(u, u_x)), mul(u, u_xx))",
        "add(add(add(add(mul(mul(u, u), u_x), u), mul(mul(u, u), u)), mul(mul(u, u), u_xx)), mul(mul(mul(mul(u, u), u_x), u_xx), u_xx))",
        "add(u, mul(u, u_xxx))",
        "u",
        "add(add(u_x, u), mul(mul(u_x, u_x), u_xx))"
      ],
      [
        "add(add(u, mul(u, u_x)), u_xx)",
        "add(add(add(u_xx, mul(u, u_x)), mul(mul(mul(mul(u, u_x), u_xx), u_xxx), u_xxx)), u_xxx)",
        "add(mul(u, u_x), u)",
        "add(add(u, mul(u, u_x)), u_xxx)",
        "mul(u, u_x)",
        "add(u_x, mul(u, u_x))",
        "add(add(add(u_x, mul(u_x, u_xxx)), mul(u, u_x)), mul(u_xxx, u_xxx))",
        "add(u_xxx, u)",
        "add(add(u_x, u), mul(u, u))",
        "add(u, mul(mul(mul(u_x, u_xx), u_xxx), u_xxx))"
      ],
      [
        "add(add(u, mul(u, u_x)), u_xx)",
        "add(add(add(u, mul(u, u_x)), mul(mul(mul(mul(u_x, u_xx), u_xxx), u_xxx), u_xxx)), u_xxx)",
        "mul(u, u_x)",
        "add(mul(u, u_x), u_xxx)",
        "u",
        "add(u, mul(u, u))",
        "add(add(u, mul(mul(u, u_x), u_xx)), mul(u, u_xxx))",
        "add(add(u_x, u), mul(mul(mul(u_x, u_xx), u_xxx), u_xxx))",
        "u_xx",
        "u_x"
      ],
      [
        "add(add(u, mul(u, u_x)), u_xx)",
        "add(add(mul(u, u_x), mul(mul(mul(mul(u_x, u_xx), u_xxx), u_xxx), u_xxx)), u_xxx)",
        "mul(u, u_x)",
        "add(mul(u, u_x), u_xxx)",
        "add(mul(u, u_x), mul(mul(mul(u, u_x), u_xx), u_xxx))",
        "add(add(u, u_xx), u_x)",
        "add(add(add(mul(mul(u, u), u_x), u), mul(mul(mul(mul(u, u_x), u_xxx), u_xxx), u_xxx)), u_xx)",
        "add(add(add(add(u_xx, mul(mul(mul(mul(u, u_xx), u_xxx), u_xxx), u_xxx)), u), mul(u, u)), u_xxx)",
        "add(add(add(add(mul(mul(u_x, u_xx), u_xxx), u), u_xx), mul(mul(mul(mul(u_x, u_xx), u_xx), u_xx), u_xx)), mul(u, u))",
        "add(mul(u, u_xxx), u)"
      ],
      [
        "add(add(u, mul(u, u_x)), u_xx)",
        "add(add(add(add(u_x, u_xxx), mul(u, u_x)), mul(u, u_xxx)), mul(u_x, u_xx))",
        "add(add(add(mul(u, u_x), mul(mul(mul(mul(u_x, u_xx), u_xxx), u_xxx), u_xxx)), u_xxx), u)",
        "mul(u, u_x)",
        "add(add(add(mul(mul(u_x, u_xx), u_xxx), u), u_xx), mul(u, u))",
        "add(mul(u, u_xxx), u)",
        "u",
        "add(u, u_x)",
        "add(mul(u_xx, u_xxx), u)",
        "add(u, mul(u_x, u_xxx))"
      ],
      [
        "add(add(u, mul(u, u_x)), u_xx)",
        "add(add(add(u_xx, mul(u, u_x)), mul(u, u_xxx)), mul(u_x, u_xx))",
        "add(add(add(mul(u, u_x), u_xxx), u), mul(u_xx, u_xx))",
        "add(add(u_xxx, mul(mul(mul(u, u), u), u_x)), u)",
        "mul(u, u_x)",
        "u",
        "add(u, mul(u, u))",
        "add(u, mul(mul(u, u_xx), u_xxx))",
        "add(add(mul(mul(mul(mul(u_x, u_x), u_x), u_x), u_xxx), u), mul(mul(mul(mul(u_x, u_x), u_xx), u_xx), u_xxx))",
        "u_xx"
      ],
      [
        "add(add(u, mul(u, u_x)), u_xx)",
        "add(add(add(mul(u, u_x), u_xxx), u), u_xx)",
        "add(u, mul(u, u_x))",
        "add(add(mul(u, u_xxx), u_x), mul(u, u_x))",
        "mul(u, u_x)",
        "add(add(add(u_xxx, mul(mul(mul(u, u), u_x), u_xxx)), mul(u, u_x)), mul(mul(mul(mul(u_x, u_xx), u_xx), u_xx), u_xxx))",
        "add(add(u, mul(u, u)), u_xx)",
        "u",
        "add(mul(u_xx, u_xxx), u)",
        "add(u, mul(mul(mul(mul(u_x, u_xx), u_xx), u_xxx), u_xxx))"
      ],
      [
        "add(add(u, mul(u, u_x)), u_xx)",
        "add(add(add(add(mul(u, u_x), u_xxx), u), u_xx), mul(mul(u_xx, u_xx), u_xxx))",
        "add(add(add(u_xx, mul(mul(mul(u, u), u_x), u_xxx)), mul(u, u_x)), mul(mul(mul(mul(u_x, u_xx), u_xx), u_xx), u_xxx))",
        "mul(u, u_x)",
        "add(u_x, mul(u, u_x))",
        "add(mul(u, u_x), mul(u_x, u_x))",
        "add(u, mul(mul(u, u), u_xx))",
        "add(u, mul(u_x, u_xx))",
        "u",
        "add(mul(u_xx, u_xxx), u)"
      ],
      [
        "add(add(u, mul(u, u_x)), u_xx)",
        "add(add(add(add(u_xx, mul(mul(mul(u, u), u_x), u_xxx)), mul(u, u_x)), mul(mul(mul(mul(u_x, u_xx), u_xx), u_xx), u_xxx)), mul(u, u_xxx))",
        "add(add(add(mul(u, u_x), u_xxx), u), mul(mul(u_xx, u_xx), u_xxx))",
        "add(mul(u, u_x), u_xxx)",
        "add(u, u_xx)",
        "add(add(add(mul(u_x, u_x), mul(mul(mul(mul(u, u_x), u_xx), u_xx), u_xxx)), u), u_xx)",
        "u",
        "add(u, mul(mul(u_x, u_xx), u_xxx))",
        "add(add(add(u, mul(mul(u_x, u_x), u_xx)), u_x), mul(mul(u, u_x), u_xx))",
        "add(add(add(mul(mul(u_xx, u_xx), u_xxx), u), mul(mul(u, u_xx), u_xx)), mul(u, u))"
      ],
      [
        "add(add(u, mul(u, u_x)), u_xx)",
        "add(add(add(u_xx, mul(u, u_x)), mul(mul(mul(mul(u_x, u_xx), u_xx), u_xx), u_xxx)), mul(u, u_xxx))",
        "add(add(add(add(mul(u, u_x), mul(u_x, u_xxx)), u_xx), mul(mul(u_xx, u_xxx), u_xxx)), mul(mul(mul(mul(u_x, u_x), u_xx), u_xxx), u_xxx))",
        "mul(u, u_x)",
        "add(add(mul(u_x, u_x), u), u_xx)",
        "u",
        "add(add(u_xxx, u), mul(mul(u_xx, u_xxx), u_xxx))",
        "add(add(add(add(u, mul(mul(u_x, u_x), u_xx)), u_x), mul(u, u)), mul(mul(mul(mul(u, u), u), u_x), u_xxx))",
        "add(add(add(add(mul(mul(u_xx, u_xx), u_xxx), u), mul(mul(u, u_xx), u_xx)), mul(mul(u, u_x), u_xx)), mul(mul(mul(mul(u, u_x), u_xxx), u_xxx), u_xxx))",
        "mul(u, u_xxx)"
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      [
        "add(add(u, mul(u, u_x)), u_xx)",
        "add(add(mul(u, u_x), mul(u_x, u_xxx)), mul(mul(u_xx, u_xxx), u_xxx))",
        "mul(u, u_x)",
        "add(u_xx, u)",
        "add(add(add(mul(u_x, u_x), u), u_xx), u_xxx)",
        "u",
        "add(add(add(u, mul(mul(u_x, u_x), u_xxx)), mul(mul(u, u_x), u_xx)), mul(mul(mul(mul(u, u), u), u_x), u_xxx))",
        "add(add(add(mul(mul(u_xx, u_xx), u_xxx), u), mul(mul(u, u_xx), u_xx)), mul(mul(mul(mul(u, u_x), u_xxx), u_xxx), u_xxx))",
        "add(add(add(u, mul(mul(mul(mul(u, u_x), u_x), u_xx), u_xxx)), mul(mul(mul(mul(u, u_x), u_x), u_x), u_xx)), mul(mul(mul(mul(u, u), u), u), u_xxx))",
        "mul(u, u_xxx)"
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        "add(u_xx, mul(u, u_x))",
        "add(add(u, mul(u, u_x)), u_xx)",
        "add(add(mul(u_x, u_xxx), mul(u, u_x)), u_xx)",
        "add(add(add(u_xx, mul(mul(mul(mul(u, u), u_x), u_x), u_xx)), mul(u_x, u_xx)), mul(u, u_x))",
        "mul(u, u_x)",
        "add(mul(u, u_x), mul(u_x, u_xxx))",
        "add(add(mul(u_x, u_x), u), u_xx)",
        "u",
        "add(u, mul(mul(u_x, u_xx), u_xx))",
        "add(add(u, mul(mul(u, u_x), u_xx)), mul(mul(mul(mul(u, u), u), u_x), u_xxx))"
      ],
      [
        "add(mul(u, u_x), u_xx)",
        "add(add(add(u, mul(u, u_x)), u_xx), u_xxx)",
        "add(add(add(mul(mul(u_x, u_xx), u_xxx), u), mul(mul(u, u), u)), mul(u, u_xxx))",
        "u",
        "add(add(mul(u_x, u_x), u), mul(u_x, u_xx))",
        "add(u, u_x)",
        "add(add(u, mul(mul(mul(u, u), u_x), u_xxx)), u_xxx)",
        "mul(mul(u, u_x), u_x)",
        "mul(u, u_xxx)",
        "u_xx"
      ],
      [
        "add(mul(u, u_x), u_xx)",
        "add(add(add(u_xx, mul(mul(u, u), u)), mul(u, u_xxx)), mul(u, u_x))",
        "add(add(mul(mul(mul(mul(u_xx, u_xx), u_xx), u_xxx), u_xxx), mul(mul(mul(u, u_x), u_xx), u_xxx)), mul(u, u_x))",
        "mul(u, u_x)",
        "u",
        "add(add(u, mul(u_x, u_x)), u_x)",
        "add(add(u, mul(mul(mul(u_x, u_xx), u_xxx), u_xxx)), mul(u, u_xxx))",
        "add(add(u, mul(mul(u_x, u_xx), u_xx)), u_xxx)",
        "add(mul(mul(mul(mul(u, u), u_x), u_xx), u_xxx), u)",
        "add(add(add(u_x, u), mul(u_x, u_xxx)), mul(mul(mul(mul(u, u_xx), u_xx), u_xxx), u_xxx))"
      ],
      [
        "add(mul(u, u_x), u_xx)",
        "add(add(add(mul(mul(u_x, u_x), u_xx), mul(mul(u_x, u_xx), u_xxx)), mul(mul(mul(u, u_x), u_xx), u_xxx)), mul(u, u_x))",
        "add(add(mul(mul(mul(mul(u_xx, u_xx), u_xx), u_xxx), u_xxx), mul(mul(mul(u, u_x), u_xx), u_xxx)), mul(u, u_x))",
        "mul(u, u_x)",
        "add(add(u, mul(u, u_xxx)), u_xx)",
        "add(add(u, u_xx), mul(u_xx, u_xxx))",
        "u",
        "add(add(mul(u, u_xxx), u), mul(u_x, u_xxx))",
        "add(add(u, mul(mul(u, u_x), u_xxx)), mul(mul(mul(mul(u, u), u_x), u_x), u_x))",
        "add(add(add(mul(mul(mul(u, u), u_xx), u_xxx), u), mul(mul(mul(mul(u, u), u_xxx), u_xxx), u_xxx)), mul(u, u_xxx))"
      ],
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        "add(mul(u, u_x), u_xx)",
        "add(add(add(mul(mul(u_x, u_x), u_xx), mul(mul(u_x, u_xx), u_xxx)), u_xx), mul(u, u_x))",
        "mul(u, u_x)",
        "add(mul(mul(mul(u, u_x), u_xx), u_xxx), mul(u, u_x))",
        "u",
        "add(u, mul(mul(mul(mul(u, u_x), u_x), u_x), u_xxx))",
        "add(mul(mul(mul(mul(u_x, u_x), u_x), u_x), u_xxx), u)",
        "mul(u, u_xxx)",
        "u_xx",
        "u_x"
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      [
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        "add(add(mul(mul(u_x, u_xx), u_xxx), u_xx), mul(u, u_x))",
        "add(add(add(u_x, mul(mul(mul(u, u_xx), u_xx), u_xxx)), mul(u, u_x)), u_xx)",
        "mul(u, u_x)",
        "add(u_x, mul(u, u_x))",
        "add(mul(mul(mul(u, u_x), u_xx), u_xxx), mul(u, u_x))",
        "u",
        "add(mul(u_x, u_x), u)",
        "add(mul(mul(u_x, u_xx), u_xxx), u)",
        "add(u, mul(mul(mul(mul(u, u_x), u_x), u_x), u_xxx))"
      ]
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    "search_topk_scores": [
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