OptimizableBatch and stress relaxations

src/fairchem/core/common/relaxation/__init__.py

@@ -0,0 +1,13 @@
+"""
+Copyright (c) Meta, Inc. and its affiliates.
+
+This source code is licensed under the MIT license found in the
+LICENSE file in the root directory of this source tree.
+"""
+
+from __future__ import annotations
+
+from .ml_relaxation import ml_relax
+from .optimizers.optimizable import OptimizableBatch, OptimizableUnitCellBatch
+
+__all__ = ["ml_relax", "OptimizableBatch", "OptimizableUnitCellBatch"]

src/fairchem/core/common/relaxation/ase_utils.py

@@ -14,13 +14,15 @@
 
 import copy
 import logging
-from typing import ClassVar
+from types import MappingProxyType
+from typing import TYPE_CHECKING
 
 import torch
 from ase import Atoms
 from ase.calculators.calculator import Calculator
-from ase.calculators.singlepoint import SinglePointCalculator as sp
+from ase.calculators.singlepoint import SinglePointCalculator
 from ase.constraints import FixAtoms
+from ase.geometry import wrap_positions
 
 from fairchem.core.common.registry import registry
 from fairchem.core.common.utils import (
@@ -33,51 +35,93 @@
 from fairchem.core.models.model_registry import model_name_to_local_file
 from fairchem.core.preprocessing import AtomsToGraphs
 
+if TYPE_CHECKING:
+    from pathlib import Path
 
-def batch_to_atoms(batch):
+    from torch_geometric.data import Batch
+
+
+# system level model predictions have different shapes than expected by ASE
+ASE_PROP_RESHAPE = MappingProxyType(
+    {"stress": (-1, 3, 3), "dielectric_tensor": (-1, 3, 3)}
+)
+
+
+def batch_to_atoms(
+    batch: Batch,
+    results: dict[str, torch.Tensor] | None = None,
+    wrap_pos: bool = True,
+    eps: float = 1e-7,
+) -> list[Atoms]:
+    """Convert a data batch to ase Atoms
+
+    Args:
+        batch: data batch
+        results: dictionary with predicted result tensors that will be added to a SinglePointCalculator. If no results
+            are given no calculator will be added to the atoms objects.
+        wrap_pos: wrap positions back into the cell.
+        eps: Small number to prevent slightly negative coordinates from being wrapped.
+
+    Returns:
+        list of Atoms
+    """
     n_systems = batch.natoms.shape[0]
     natoms = batch.natoms.tolist()
     numbers = torch.split(batch.atomic_numbers, natoms)
     fixed = torch.split(batch.fixed.to(torch.bool), natoms)
-    forces = torch.split(batch.force, natoms)
+    if results is not None:
+        results = {
+            key: val.view(ASE_PROP_RESHAPE.get(key, -1)).tolist()
+            if len(val) == len(batch)
+            else [v.cpu().detach().numpy() for v in torch.split(val, natoms)]
+            for key, val in results.items()
+        }
+
     positions = torch.split(batch.pos, natoms)
     tags = torch.split(batch.tags, natoms)
     cells = batch.cell
-    energies = batch.energy.view(-1).tolist()
 
     atoms_objects = []
     for idx in range(n_systems):
+        pos = positions[idx].cpu().detach().numpy()
+        cell = cells[idx].cpu().detach().numpy()
+
+        # TODO take pbc from data
+        if wrap_pos:
+            pos = wrap_positions(pos, cell, pbc=[True, True, True], eps=eps)
+
         atoms = Atoms(
             numbers=numbers[idx].tolist(),
-            positions=positions[idx].cpu().detach().numpy(),
+            cell=cell,
+            positions=pos,
             tags=tags[idx].tolist(),
-            cell=cells[idx].cpu().detach().numpy(),
             constraint=FixAtoms(mask=fixed[idx].tolist()),
             pbc=[True, True, True],
         )
-        calc = sp(
-            atoms=atoms,
-            energy=energies[idx],
-            forces=forces[idx].cpu().detach().numpy(),
-        )
-        atoms.set_calculator(calc)
+
+        if results is not None:
+            calc = SinglePointCalculator(
+                atoms=atoms, **{key: val[idx] for key, val in results.items()}
+            )
+            atoms.set_calculator(calc)
+
         atoms_objects.append(atoms)
 
     return atoms_objects
 
 
 class OCPCalculator(Calculator):
-    implemented_properties: ClassVar[list[str]] = ["energy", "forces"]
+    """ASE based calculator using an OCP model"""
+
+    _reshaped_props = ASE_PROP_RESHAPE
 
     def __init__(
         self,
         config_yml: str | None = None,
-        checkpoint_path: str | None = None,
+        checkpoint_path: str | Path | None = None,
         model_name: str | None = None,
         local_cache: str | None = None,
         trainer: str | None = None,
-        cutoff: int = 6,
-        max_neighbors: int = 50,
         cpu: bool = True,
         seed: int | None = None,
     ) -> None:
@@ -96,16 +140,12 @@ def __init__(
                 Directory to save pretrained model checkpoints.
             trainer (str):
                 OCP trainer to be used. "forces" for S2EF, "energy" for IS2RE.
-            cutoff (int):
-                Cutoff radius to be used for data preprocessing.
-            max_neighbors (int):
-                Maximum amount of neighbors to store for a given atom.
             cpu (bool):
                 Whether to load and run the model on CPU. Set `False` for GPU.
         """
         setup_imports()
         setup_logging()
-        Calculator.__init__(self)
+        super().__init__()
 
         if model_name is not None:
             if checkpoint_path is not None:
@@ -165,9 +205,8 @@ def __init__(
         ### backwards compatability with OCP v<2.0
         config = update_config(config)
 
-        # Save config so obj can be transported over network (pkl)
         self.config = copy.deepcopy(config)
-        self.config["checkpoint"] = checkpoint_path
+        self.config["checkpoint"] = str(checkpoint_path)
         del config["dataset"]["src"]
 
         self.trainer = registry.get_trainer_class(config["trainer"])(
@@ -199,14 +238,13 @@ def __init__(
             self.trainer.set_seed(seed)
 
         self.a2g = AtomsToGraphs(
-            max_neigh=max_neighbors,
-            radius=cutoff,
             r_energy=False,
             r_forces=False,
             r_distances=False,
-            r_edges=False,
             r_pbc=True,
+            r_edges=not self.trainer.model.otf_graph,  # otf graph should not be a property of the model...
         )
+        self.implemented_properties = list(self.config["outputs"].keys())
 
     def load_checkpoint(
         self, checkpoint_path: str, checkpoint: dict | None = None
@@ -217,6 +255,8 @@ def load_checkpoint(
         Args:
             checkpoint_path: string
                 Path to trained model
+            checkpoint: dict
+                A pretrained checkpoint dict
         """
         try:
             self.trainer.load_checkpoint(
@@ -225,14 +265,20 @@ def load_checkpoint(
         except NotImplementedError:
             logging.warning("Unable to load checkpoint!")
 
-    def calculate(self, atoms: Atoms, properties, system_changes) -> None:
-        Calculator.calculate(self, atoms, properties, system_changes)
-        data_object = self.a2g.convert(atoms)
-        batch = data_list_collater([data_object], otf_graph=True)
+    def calculate(self, atoms: Atoms | Batch, properties, system_changes) -> None:
+        """Calculate implemented properties for a single Atoms object or a Batch of them."""
+        super().calculate(atoms, properties, system_changes)
+        if isinstance(atoms, Atoms):
+            data_object = self.a2g.convert(atoms)
+            batch = data_list_collater([data_object], otf_graph=True)
+        else:
+            batch = atoms
 
         predictions = self.trainer.predict(batch, per_image=False, disable_tqdm=True)
 
         for key in predictions:
             _pred = predictions[key]
             _pred = _pred.item() if _pred.numel() == 1 else _pred.cpu().numpy()
+            if key in OCPCalculator._reshaped_props:
+                _pred = _pred.reshape(OCPCalculator._reshaped_props.get(key)).squeeze()
             self.results[key] = _pred

src/fairchem/core/common/relaxation/ml_relaxation.py

@@ -10,85 +10,126 @@
 import logging
 from collections import deque
 from pathlib import Path
+from typing import TYPE_CHECKING
 
 import torch
 from torch_geometric.data import Batch
 
 from fairchem.core.common.typing import assert_is_instance
 from fairchem.core.datasets.lmdb_dataset import data_list_collater
 
-from .optimizers.lbfgs_torch import LBFGS, TorchCalc
+from .optimizable import OptimizableBatch, OptimizableUnitCellBatch
+from .optimizers.lbfgs_torch import LBFGS
+
+if TYPE_CHECKING:
+    from fairchem.core.trainers import BaseTrainer
 
 
 def ml_relax(
-    batch,
-    model,
+    batch: Batch,
+    model: BaseTrainer,
     steps: int,
     fmax: float,
-    relax_opt,
-    save_full_traj,
-    device: str = "cuda:0",
-    transform=None,
-    early_stop_batch: bool = False,
+    relax_opt: dict[str] | None = None,
+    relax_cell: bool = False,
+    relax_volume: bool = False,
+    save_full_traj: bool = True,
+    transform: torch.nn.Module | None = None,
+    mask_converged: bool = True,
 ):
-    """
-    Runs ML-based relaxations.
+    """Runs ML-based relaxations.
+
     Args:
-        batch: object
-        model: object
-        steps: int
-            Max number of steps in the structure relaxation.
-        fmax: float
-            Structure relaxation terminates when the max force
-            of the system is no bigger than fmax.
-        relax_opt: str
-            Optimizer and corresponding parameters to be used for structure relaxations.
-        save_full_traj: bool
-            Whether to save out the full ASE trajectory. If False, only save out initial and final frames.
+        batch: a data batch object.
+        model: a trainer object with model.
+        steps: Max number of steps in the structure relaxation.
+        fmax: Structure relaxation terminates when the max force of the system is no bigger than fmax.
+        relax_opt: Optimizer parameters to be used for structure relaxations.
+        relax_cell: if true will use stress predictions to relax crystallographic cell.
+            The model given must predict stress
+        relax_volume: if true will relax the cell isotropically. the given model must predict stress.
+        save_full_traj: Whether to save out the full ASE trajectory. If False, only save out initial and final frames.
+        mask_converged: whether to mask batches where all atoms are below convergence threshold
+        cumulative_mask: if true, once system is masked then it remains masked even if new predictions give forces
+                above threshold, ie. once masked always masked. Note if this is used make sure to check convergence with
+                the same fmax always
     """
+    relax_opt = relax_opt or {}
+    # if not pbc is set, ignore it when comparing batches
+    if not hasattr(batch, "pbc"):
+        OptimizableBatch.ignored_changes = {"pbc"}
+
     batches = deque([batch])
     relaxed_batches = []
     while batches:
         batch = batches.popleft()
         oom = False
         ids = batch.sid
-        calc = TorchCalc(model, transform)
+
+        # clone the batch otherwise you can not run batch.to_data_list
+        # see https://github.com/pyg-team/pytorch_geometric/issues/8439#issuecomment-1826747915
+        if relax_cell or relax_volume:
+            optimizable = OptimizableUnitCellBatch(
+                batch.clone(),
+                trainer=model,
+                transform=transform,
+                mask_converged=mask_converged,
+                hydrostatic_strain=relax_volume,
+            )
+        else:
+            optimizable = OptimizableBatch(
+                batch.clone(),
+                trainer=model,
+                transform=transform,
+                mask_converged=mask_converged,
+            )
 
         # Run ML-based relaxation
-        traj_dir = relax_opt.get("traj_dir", None)
+        traj_dir = relax_opt.get("traj_dir")
+        relax_opt.update({"traj_dir": Path(traj_dir) if traj_dir is not None else None})
+
         optimizer = LBFGS(
-            batch,
-            calc,
-            maxstep=relax_opt.get("maxstep", 0.2),
-            memory=relax_opt["memory"],
-            damping=relax_opt.get("damping", 1.2),
-            alpha=relax_opt.get("alpha", 80.0),
-            device=device,
+            optimizable_batch=optimizable,
             save_full_traj=save_full_traj,
-            traj_dir=Path(traj_dir) if traj_dir is not None else None,
             traj_names=ids,
-            early_stop_batch=early_stop_batch,
+            **relax_opt,
         )
 
         e: RuntimeError | None = None
         try:
-            relaxed_batch = optimizer.run(fmax=fmax, steps=steps)
-            relaxed_batches.append(relaxed_batch)
+            optimizer.run(fmax=fmax, steps=steps)
+            relaxed_batches.append(optimizable.batch)
         except RuntimeError as err:
             e = err
             oom = True
             torch.cuda.empty_cache()
 
         if oom:
-            # move OOM recovery code outside of except clause to allow tensors to be freed.
+            # move OOM recovery code outside off except clause to allow tensors to be freed.
             data_list = batch.to_data_list()
             if len(data_list) == 1:
                 raise assert_is_instance(e, RuntimeError)
             logging.info(
                 f"Failed to relax batch with size: {len(data_list)}, splitting into two..."
             )
             mid = len(data_list) // 2
-            batches.appendleft(data_list_collater(data_list[:mid]))
-            batches.appendleft(data_list_collater(data_list[mid:]))
+            batches.appendleft(
+                data_list_collater(data_list[:mid], otf_graph=optimizable.otf_graph)
+            )
+            batches.appendleft(
+                data_list_collater(data_list[mid:], otf_graph=optimizable.otf_graph)
+            )
+
+    # reset for good measure
+    OptimizableBatch.ignored_changes = {}
+
+    relaxed_batch = Batch.from_data_list(relaxed_batches)
+
+    # Batch.from_data_list is not intended to be used with a list of batches, so when sid is a list of str
+    # it will be incorrectly collated as a list of lists for each batch.
+    # but we can not use to_data_list in the relaxed batches (since they have been changed, see linked comment above).
+    # So instead just manually fix it for now. Remove this once pyg dependency is removed
+    if isinstance(relaxed_batch.sid, list):
+        relaxed_batch.sid = [sid for sid_list in relaxed_batch.sid for sid in sid_list]
 
-    return Batch.from_data_list(relaxed_batches)
+    return relaxed_batch