# Copyright 2021 AlQuraishi Laboratory
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import os
import math
import torch
import numpy as np
import unittest
import ml_collections as mlc

from openfold.features.data_transforms import make_atom14_masks
from openfold.utils.affine_utils import T, affine_vector_to_4x4
import openfold.utils.feats as feats
from openfold.utils.loss import (
    torsion_angle_loss,
    compute_fape,
    between_residue_bond_loss,
    between_residue_clash_loss,
    find_structural_violations,
    compute_renamed_ground_truth,
    masked_msa_loss,
    distogram_loss,
    experimentally_resolved_loss,
    violation_loss,
    fape_loss,
    lddt_loss,
    supervised_chi_loss,
    backbone_loss,
    sidechain_loss,
    tm_loss,
)
from openfold.utils.tensor_utils import (
    tree_map, 
    tensor_tree_map, 
    dict_multimap,
)
import tests.compare_utils as compare_utils
from tests.config import consts
from tests.data_utils import random_affines_vector, random_affines_4x4

if(compare_utils.alphafold_is_installed()):
    alphafold = compare_utils.import_alphafold()
    import jax
    import haiku as hk


class TestLoss(unittest.TestCase):
    def test_run_torsion_angle_loss(self):
        batch_size = consts.batch_size
        n_res = consts.n_res

        a = torch.rand((batch_size, n_res, 7, 2))
        a_gt = torch.rand((batch_size, n_res, 7, 2))
        a_alt_gt = torch.rand((batch_size, n_res, 7, 2))

        loss = torsion_angle_loss(a, a_gt, a_alt_gt)

    def test_run_fape(self):
        batch_size = consts.batch_size
        n_frames = 7
        n_atoms = 5

        x = torch.rand((batch_size, n_atoms, 3))
        x_gt = torch.rand((batch_size, n_atoms, 3))
        rots = torch.rand((batch_size, n_frames, 3, 3))
        rots_gt = torch.rand((batch_size, n_frames, 3, 3))
        trans = torch.rand((batch_size, n_frames, 3))
        trans_gt = torch.rand((batch_size, n_frames, 3))
        t = T(rots, trans)
        t_gt = T(rots_gt, trans_gt)
        frames_mask = torch.randint(0, 2, (batch_size, n_frames)).float()
        positions_mask = torch.randint(0, 2, (batch_size, n_atoms)).float()
        length_scale = 10

        loss = compute_fape(
            pred_frames=t,
            target_frames=t_gt,
            frames_mask=frames_mask,
            pred_positions=x,
            target_positions=x_gt,
            positions_mask=positions_mask,
            length_scale=length_scale,
        )

    def test_run_between_residue_bond_loss(self):
        bs = consts.batch_size
        n = consts.n_res
        pred_pos = torch.rand(bs, n, 14, 3)
        pred_atom_mask = torch.randint(0, 2, (bs, n, 14))
        residue_index = torch.arange(n).unsqueeze(0)
        aatype = torch.randint(0, 22, (bs, n,))
        
        between_residue_bond_loss(
            pred_pos,
            pred_atom_mask,
            residue_index, 
            aatype,
        )

    @compare_utils.skip_unless_alphafold_installed()
    def test_between_residue_bond_loss_compare(self):
        def run_brbl(pred_pos, pred_atom_mask, residue_index, aatype):
            return alphafold.model.all_atom.between_residue_bond_loss(
                pred_pos,
                pred_atom_mask,
                residue_index,
                aatype,
            )
    
        f = hk.transform(run_brbl)
    
        n_res = consts.n_res 
        pred_pos = np.random.rand(n_res, 14, 3).astype(np.float32)
        pred_atom_mask = np.random.randint(
            0, 2, (n_res, 14)
        ).astype(np.float32)
        residue_index = np.arange(n_res)
        aatype = np.random.randint(0, 22, (n_res,))
        
        out_gt = f.apply(
            {}, None, 
            pred_pos, 
            pred_atom_mask, 
            residue_index,
            aatype,
        )
        out_gt = jax.tree_map(lambda x: x.block_until_ready(), out_gt)
        out_gt = jax.tree_map(lambda x: torch.tensor(np.copy(x)), out_gt)
    
        out_repro = between_residue_bond_loss(
            torch.tensor(pred_pos).cuda(),
            torch.tensor(pred_atom_mask).cuda(),
            torch.tensor(residue_index).cuda(),
            torch.tensor(aatype).cuda(),
        )
        out_repro = tensor_tree_map(lambda x: x.cpu(), out_repro)
    
        for k in out_gt.keys():
            self.assertTrue(
                torch.max(torch.abs(out_gt[k] - out_repro[k])) < consts.eps
            )


    def test_run_between_residue_clash_loss(self):
        bs = consts.batch_size
        n = consts.n_res

        pred_pos = torch.rand(bs, n, 14, 3)
        pred_atom_mask = torch.randint(0, 2, (bs, n, 14)).float()
        atom14_atom_radius = torch.rand(bs, n, 14)
        residue_index = torch.arange(n).unsqueeze(0)

        loss = between_residue_clash_loss(
            pred_pos,
            pred_atom_mask,
            atom14_atom_radius, 
            residue_index,
        )

    @compare_utils.skip_unless_alphafold_installed()
    def test_between_residue_clash_loss_compare(self):
        def run_brcl(pred_pos, atom_exists, atom_radius, res_ind):
            return alphafold.model.all_atom.between_residue_clash_loss(
                pred_pos,
                atom_exists,
                atom_radius,
                res_ind,
            )

        f = hk.transform(run_brcl)

        n_res = consts.n_res

        pred_pos = np.random.rand(n_res, 14, 3).astype(np.float32)
        atom_exists = np.random.randint(0, 2, (n_res, 14)).astype(np.float32)
        atom_radius = np.random.rand(n_res, 14).astype(np.float32)
        res_ind = np.arange(n_res,)
        
        out_gt = f.apply(
            {}, None, 
            pred_pos,
            atom_exists,
            atom_radius,
            res_ind,
        )
        out_gt = jax.tree_map(lambda x: x.block_until_ready(), out_gt)
        out_gt = jax.tree_map(lambda x: torch.tensor(np.copy(x)), out_gt)
   
        out_repro = between_residue_clash_loss(
            torch.tensor(pred_pos).cuda(),
            torch.tensor(atom_exists).cuda(),
            torch.tensor(atom_radius).cuda(),
            torch.tensor(res_ind).cuda(),
        )
        out_repro = tensor_tree_map(lambda x: x.cpu(), out_repro)
    
        for k in out_gt.keys():
            self.assertTrue(
                torch.max(torch.abs(out_gt[k] - out_repro[k])) < consts.eps
            )

    def test_find_structural_violations(self):
        n = consts.n_res

        batch = {
            "atom14_atom_exists": torch.randint(0, 2, (n, 14)),
            "residue_index": torch.arange(n),
            "aatype": torch.randint(0, 21, (n,)),
            "residx_atom14_to_atom37": torch.randint(0, 37, (n, 14)).long(),
        }

        pred_pos = torch.rand(n, 14, 3)
        
        config = {
            "clash_overlap_tolerance": 1.5,
            "violation_tolerance_factor": 12.0,
        }

        find_structural_violations(batch, pred_pos, **config)

    @compare_utils.skip_unless_alphafold_installed()
    def test_find_structural_violations_compare(self):
        def run_fsv(batch, pos, config):
            cwd = os.getcwd()
            os.chdir("tests/test_data")
            loss = alphafold.model.folding.find_structural_violations(
                batch,
                pos,
                config,
            )
            os.chdir(cwd)
            return loss

    
        f = hk.transform(run_fsv)
    
        n_res = consts.n_res
    
        batch = {
            "atom14_atom_exists": np.random.randint(0, 2, (n_res, 14)),
            "residue_index": np.arange(n_res),
            "aatype": np.random.randint(0, 21, (n_res,)),
            "residx_atom14_to_atom37": 
                np.random.randint(0, 37, (n_res, 14)).astype(np.int64),
        }
    
        pred_pos = np.random.rand(n_res, 14, 3)
            
        config = mlc.ConfigDict({
            "clash_overlap_tolerance": 1.5,
            "violation_tolerance_factor": 12.0,
        })
    
        out_gt = f.apply(
            {}, None, 
            batch,
            pred_pos,
            config
        )
        out_gt = jax.tree_map(lambda x: x.block_until_ready(), out_gt)
        out_gt = jax.tree_map(lambda x: torch.tensor(np.copy(x)), out_gt)
    
    
        batch = tree_map(
            lambda x: torch.tensor(x).cuda(), batch, np.ndarray
        )
        out_repro = find_structural_violations(
            batch,
            torch.tensor(pred_pos).cuda(),
            **config,
        )
        out_repro = tensor_tree_map(lambda x: x.cpu(), out_repro)
    
        def compare(out):
            gt, repro = out
            assert(torch.max(torch.abs(gt - repro)) < consts.eps)
    
        dict_multimap(compare, [out_gt, out_repro])

    @compare_utils.skip_unless_alphafold_installed()
    def test_compute_renamed_ground_truth_compare(self):
        def run_crgt(batch, atom14_pred_pos):
            return alphafold.model.folding.compute_renamed_ground_truth(
                batch,
                atom14_pred_pos,
            )
    
        f = hk.transform(run_crgt)
    
        n_res = consts.n_res
    
        batch = {
            "seq_mask": np.random.randint(0, 2, (n_res,)).astype(np.float32),
            "aatype": np.random.randint(0, 21, (n_res,)),
            "atom14_gt_positions": np.random.rand(n_res, 14, 3),
            "atom14_gt_exists": 
                np.random.randint(0, 2, (n_res, 14)).astype(np.float32),
        }
    
        def _build_extra_feats_np():
            b = tree_map(lambda n: torch.tensor(n), batch, np.ndarray)
            b.update(feats.build_ambiguity_feats(b))
            b.update(make_atom14_masks(b))
            return tensor_tree_map(lambda t: np.array(t), b)
    
        batch = _build_extra_feats_np()
    
        atom14_pred_pos = np.random.rand(n_res, 14, 3)
    
        out_gt = f.apply({}, None, batch, atom14_pred_pos)
        out_gt = jax.tree_map(lambda x: torch.tensor(np.array(x)), out_gt)
    
        batch = tree_map(
            lambda x: torch.tensor(x).cuda(), batch, np.ndarray
        )
        atom14_pred_pos = torch.tensor(atom14_pred_pos).cuda()
    
        out_repro = compute_renamed_ground_truth(batch, atom14_pred_pos)
        out_repro = tensor_tree_map(lambda t: t.cpu(), out_repro)
    
        for k in out_repro:
            self.assertTrue(
                torch.max(torch.abs(out_gt[k] - out_repro[k])) < consts.eps
            )

    @compare_utils.skip_unless_alphafold_installed()
    def test_msa_loss_compare(self):
        def run_msa_loss(value, batch):
            config = compare_utils.get_alphafold_config()
            msa_head = alphafold.model.modules.MaskedMsaHead(
                config.model.heads.masked_msa, config.model.global_config
            )
            return msa_head.loss(value, batch)
    
        f = hk.transform(run_msa_loss)
    
        n_res = consts.n_res
        n_seq = consts.n_seq
    
        value = {
            "logits": np.random.rand(n_res, n_seq, 23).astype(np.float32),
        }
    
        batch = {
            "true_msa": np.random.randint(0, 21, (n_res, n_seq)),
            "bert_mask": 
                np.random.randint(0, 2, (n_res, n_seq)).astype(np.float32),
        }
    
        out_gt = f.apply({}, None, value, batch)["loss"]
        out_gt = torch.tensor(np.array(out_gt))
    
        value = tree_map(
            lambda x: torch.tensor(x).cuda(), value, np.ndarray
        ) 
        batch = tree_map(
            lambda x: torch.tensor(x).cuda(), batch, np.ndarray
        )
    
        with torch.no_grad():
            out_repro = masked_msa_loss(
                value["logits"],
                **batch,
            )  
        out_repro = tensor_tree_map(lambda t: t.cpu(), out_repro)
        
        self.assertTrue(torch.max(torch.abs(out_gt - out_repro)) < consts.eps)

    @compare_utils.skip_unless_alphafold_installed()
    def test_distogram_loss_compare(self):
        config = compare_utils.get_alphafold_config()
        c_distogram = config.model.heads.distogram
        def run_distogram_loss(value, batch):
            dist_head = alphafold.model.modules.DistogramHead(
                c_distogram, config.model.global_config
            )
            return dist_head.loss(value, batch)
    
        f = hk.transform(run_distogram_loss)
    
        n_res = consts.n_res
    
        value = {
            "logits": np.random.rand(
                n_res, 
                n_res, 
                c_distogram.num_bins
            ).astype(np.float32),
            "bin_edges": np.linspace(
                c_distogram.first_break,
                c_distogram.last_break,
                c_distogram.num_bins,
            )
        }
    
        batch = {
            "pseudo_beta": np.random.rand(n_res, 3).astype(np.float32),
            "pseudo_beta_mask": np.random.randint(0, 2, (n_res,))
        }
    
        out_gt = f.apply({}, None, value, batch)["loss"]
        out_gt = torch.tensor(np.array(out_gt))
    
        value = tree_map(
            lambda x: torch.tensor(x).cuda(), value, np.ndarray
        )
    
        batch = tree_map(
            lambda x: torch.tensor(x).cuda(), batch, np.ndarray
        )
    
        with torch.no_grad():
            out_repro = distogram_loss(
                logits=value["logits"],
                min_bin=c_distogram.first_break,
                max_bin=c_distogram.last_break,
                no_bins=c_distogram.num_bins,
                **batch,
            ) 
        
        out_repro = tensor_tree_map(lambda t: t.cpu(), out_repro)
    
        self.assertTrue(torch.max(torch.abs(out_gt - out_repro)) < consts.eps)

    @compare_utils.skip_unless_alphafold_installed()
    def test_experimentally_resolved_loss_compare(self):
        config = compare_utils.get_alphafold_config()
        c_experimentally_resolved = config.model.heads.experimentally_resolved
        def run_experimentally_resolved_loss(value, batch):
            er_head = alphafold.model.modules.ExperimentallyResolvedHead(
                c_experimentally_resolved, config.model.global_config
            )
            return er_head.loss(value, batch)
    
        f = hk.transform(run_experimentally_resolved_loss)
    
        n_res = consts.n_res
    
        value = {
            "logits": np.random.rand(n_res, 37).astype(np.float32),
        }
    
        batch = {
            "all_atom_mask": np.random.randint(0, 2, (n_res, 37)),
            "atom37_atom_exists": np.random.randint(0, 2, (n_res, 37)),
            "resolution": np.array(1.0)
        }
    
        out_gt = f.apply({}, None, value, batch)["loss"]
        out_gt = torch.tensor(np.array(out_gt))
    
        value = tree_map(
            lambda x: torch.tensor(x).cuda(), value, np.ndarray
        )
    
        batch = tree_map(
            lambda x: torch.tensor(x).cuda(), batch, np.ndarray
        )
    
        with torch.no_grad():
            out_repro = experimentally_resolved_loss(
                logits=value["logits"],
                min_resolution=c_experimentally_resolved.min_resolution,
                max_resolution=c_experimentally_resolved.max_resolution,
                **batch,
            ) 
        
        out_repro = tensor_tree_map(lambda t: t.cpu(), out_repro)
    
        self.assertTrue(torch.max(torch.abs(out_gt - out_repro)) < consts.eps)

    @compare_utils.skip_unless_alphafold_installed()
    def test_supervised_chi_loss_compare(self):
        config = compare_utils.get_alphafold_config()
        c_chi_loss = config.model.heads.structure_module
        def run_supervised_chi_loss(value, batch):
            ret = {
                "loss": jax.numpy.array(0.),
            }
            alphafold.model.folding.supervised_chi_loss(
                ret, batch, value, c_chi_loss
            )
            return ret["loss"]

        f = hk.transform(run_supervised_chi_loss)

        n_res = consts.n_res

        value = {
            "sidechains": {
                "angles_sin_cos": 
                    np.random.rand(8, n_res, 7, 2).astype(np.float32),
                "unnormalized_angles_sin_cos": 
                    np.random.rand(8, n_res, 7, 2).astype(np.float32),
            }
        }

        batch = {
            "aatype": np.random.randint(0, 21, (n_res,)),
            "seq_mask": np.random.randint(0, 2, (n_res,)),
            "chi_mask": np.random.randint(0, 2, (n_res, 4)),
            "chi_angles": np.random.rand(n_res, 4).astype(np.float32),
        }

        out_gt = f.apply({}, None, value, batch)
        out_gt = torch.tensor(np.array(out_gt.block_until_ready()))
        value = tree_map(
            lambda x: torch.tensor(x).cuda(), value, np.ndarray
        )

        batch = tree_map(
            lambda x: torch.tensor(x).cuda(), batch, np.ndarray
        )

        batch["chi_angles_sin_cos"] = torch.stack(
            [
                torch.sin(batch["chi_angles"]),
                torch.cos(batch["chi_angles"]),
            ],
            dim=-1,
        )

        with torch.no_grad():
            out_repro = supervised_chi_loss(
                chi_weight=c_chi_loss.chi_weight,
                angle_norm_weight=c_chi_loss.angle_norm_weight,
                **{**batch, **value["sidechains"]}
            ) 
        
        out_repro = tensor_tree_map(lambda t: t.cpu(), out_repro)

        self.assertTrue(torch.max(torch.abs(out_gt - out_repro)) < consts.eps)

    @compare_utils.skip_unless_alphafold_installed()
    def test_violation_loss_compare(self):
        config = compare_utils.get_alphafold_config()
        c_viol = config.model.heads.structure_module
        def run_viol_loss(batch, atom14_pred_pos):
            ret = {
                "loss": np.array(0.).astype(np.float32),
            }
            value = {}
            value["violations"] = (
                alphafold.model.folding.find_structural_violations(
                    batch, 
                    atom14_pred_pos, 
                    c_viol,
                )
            )
            alphafold.model.folding.structural_violation_loss(
                ret, batch, value, c_viol,
            )
            return ret["loss"]
    
        f = hk.transform(run_viol_loss)
    
        n_res = consts.n_res
    
        batch = {
            "seq_mask": np.random.randint(0, 2, (n_res,)).astype(np.float32),
            "residue_index": np.arange(n_res),
            "aatype": np.random.randint(0, 21, (n_res,)),
        }
        alphafold.model.tf.data_transforms.make_atom14_masks(batch) 
        batch = {k:np.array(v) for k,v in batch.items()}
    
        atom14_pred_pos = np.random.rand(n_res, 14, 3).astype(np.float32)
    
        out_gt = f.apply({}, None, batch, atom14_pred_pos)
        out_gt = torch.tensor(np.array(out_gt.block_until_ready()))
    
        batch = tree_map(
            lambda n: torch.tensor(n).cuda(), batch, np.ndarray
        )
        atom14_pred_pos = torch.tensor(atom14_pred_pos).cuda()
    
        batch.update(feats.compute_residx(batch))
    
        out_repro = violation_loss(
            find_structural_violations(batch, atom14_pred_pos, **c_viol),
            **batch,
        )
        out_repro = out_repro.cpu()
    
        self.assertTrue(torch.max(torch.abs(out_gt - out_repro)) < consts.eps)

    @compare_utils.skip_unless_alphafold_installed()
    def test_lddt_loss_compare(self):
        config = compare_utils.get_alphafold_config()
        c_plddt = config.model.heads.predicted_lddt
        def run_plddt_loss(value, batch):
            head = alphafold.model.modules.PredictedLDDTHead(
                c_plddt, config.model.global_config
            )
            return head.loss(value, batch)
        
        f = hk.transform(run_plddt_loss)
        
        n_res = consts.n_res
    
        value = {
            "predicted_lddt": {
                "logits": 
                    np.random.rand(n_res, c_plddt.num_bins).astype(np.float32),
            },
            "structure_module": {
                "final_atom_positions":
                    np.random.rand(n_res, 37, 3).astype(np.float32),
            }
        }
    
        batch = {
            "all_atom_positions": 
                np.random.rand(n_res, 37, 3).astype(np.float32),
            "all_atom_mask": 
                np.random.randint(0, 2, (n_res, 37)).astype(np.float32),
            "resolution": np.array(1.).astype(np.float32),
        }
    
        out_gt = f.apply({}, None, value, batch)
        out_gt = torch.tensor(np.array(out_gt["loss"]))
    
        to_tensor = lambda t: torch.tensor(t).cuda()
        value = tree_map(to_tensor, value, np.ndarray)
        batch = tree_map(to_tensor, batch, np.ndarray)
    
        out_repro = lddt_loss(
            logits=value["predicted_lddt"]["logits"],
            all_atom_pred_pos=value["structure_module"]["final_atom_positions"],
            **{**batch, **c_plddt},
        )
        out_repro = out_repro.cpu()
    
        self.assertTrue(torch.max(torch.abs(out_gt - out_repro)) < consts.eps)

    @compare_utils.skip_unless_alphafold_installed()
    def test_backbone_loss(self):
        config = compare_utils.get_alphafold_config()
        c_sm = config.model.heads.structure_module
        def run_bb_loss(batch, value):
            ret = {
                "loss": np.array(0.),
            }
            alphafold.model.folding.backbone_loss(ret, batch, value, c_sm)
            return ret["loss"]

        f = hk.transform(run_bb_loss)

        n_res = consts.n_res

        batch = {
            "backbone_affine_tensor": random_affines_vector((n_res,)),
            "backbone_affine_mask": 
                np.random.randint(0, 2, (n_res,)).astype(np.float32),
            "use_clamped_fape": np.array(0.), 
        }

        value = {
            "traj": random_affines_vector((c_sm.num_layer, n_res,)),
        }

        out_gt = f.apply({}, None, batch, value)
        out_gt = torch.tensor(np.array(out_gt.block_until_ready()))

        to_tensor = lambda t: torch.tensor(t).cuda()
        batch = tree_map(to_tensor, batch, np.ndarray)
        value = tree_map(to_tensor, value, np.ndarray)

        batch["backbone_affine_tensor"] = affine_vector_to_4x4(
            batch["backbone_affine_tensor"]
        )
        value["traj"] = affine_vector_to_4x4(value["traj"])

        out_repro = backbone_loss(traj=value["traj"], **{**batch, **c_sm})
        out_repro = out_repro.cpu()

        self.assertTrue(torch.max(torch.abs(out_gt - out_repro)) < consts.eps)

    @compare_utils.skip_unless_alphafold_installed()
    def test_sidechain_loss_compare(self):
        config = compare_utils.get_alphafold_config()
        c_sm = config.model.heads.structure_module
        def run_sidechain_loss(batch, value, atom14_pred_positions):
            batch = {
                **batch,
                **alphafold.model.all_atom.atom37_to_frames(
                    batch["aatype"],
                    batch["all_atom_positions"],
                    batch["all_atom_mask"],
                )
            }
            v = {}
            v["sidechains"] = {}
            v["sidechains"]["frames"] = (
                alphafold.model.r3.rigids_from_tensor4x4(
                    value["sidechains"]["frames"]
                )
            )
            v["sidechains"]["atom_pos"] = alphafold.model.r3.vecs_from_tensor(
                value["sidechains"]["atom_pos"]
            )
            v.update(alphafold.model.folding.compute_renamed_ground_truth(
                batch,
                atom14_pred_positions,
            ))
            value = v
     
            ret = alphafold.model.folding.sidechain_loss(batch, value, c_sm)
            return ret["loss"]
    
        f = hk.transform(run_sidechain_loss)
    
        n_res = consts.n_res
    
        batch = {
            "seq_mask": np.random.randint(0, 2, (n_res,)).astype(np.float32),
            "aatype": np.random.randint(0, 21, (n_res,)),
            "atom14_gt_positions": 
                np.random.rand(n_res, 14, 3).astype(np.float32),
            "atom14_gt_exists": 
                np.random.randint(0, 2, (n_res, 14)).astype(np.float32),
            "all_atom_positions": 
                np.random.rand(n_res, 37, 3).astype(np.float32),
            "all_atom_mask": 
                np.random.randint(0, 2, (n_res, 37)).astype(np.float32),
        }
    
        def _build_extra_feats_np():
            b = tree_map(lambda n: torch.tensor(n), batch, np.ndarray)
            b.update(feats.build_ambiguity_feats(b))
            b.update(feats.compute_residx(b))
            return tensor_tree_map(lambda t: np.array(t), b)
    
        batch = _build_extra_feats_np() 
    
        value = {
            "sidechains": {
                "frames": random_affines_4x4((c_sm.num_layer, n_res, 8)),
                "atom_pos": 
                    np.random.rand(
                        c_sm.num_layer, n_res, 14, 3
                    ).astype(np.float32),
            }
        }
    
        atom14_pred_pos = np.random.rand(n_res, 14, 3).astype(np.float32)
    
        out_gt = f.apply({}, None, batch, value, atom14_pred_pos)
        out_gt = torch.tensor(np.array(out_gt.block_until_ready()))
    
        to_tensor = lambda t: torch.tensor(t).cuda()
        batch = tree_map(to_tensor, batch, np.ndarray)
        value = tree_map(to_tensor, value, np.ndarray)
        atom14_pred_pos = to_tensor(atom14_pred_pos)
    
        batch.update(feats.atom37_to_frames(eps=1e-8, **batch))
        batch.update(compute_renamed_ground_truth(batch, atom14_pred_pos))
    
        out_repro = sidechain_loss(
            sidechain_frames=value["sidechains"]["frames"],
            sidechain_atom_pos=value["sidechains"]["atom_pos"],
            **{**batch, **c_sm},
        )
        out_repro = out_repro.cpu()
    
        self.assertTrue(torch.max(torch.abs(out_gt - out_repro)) < consts.eps)

    @compare_utils.skip_unless_alphafold_installed()
    def test_tm_loss_compare(self):
        config = compare_utils.get_alphafold_config()
        c_tm = config.model.heads.predicted_aligned_error
        def run_tm_loss(representations, batch, value):
            head = alphafold.model.modules.PredictedAlignedErrorHead(
                c_tm, config.model.global_config
            )
            v = {}
            v.update(value)
            v["predicted_aligned_error"] = head(representations, batch, False)
            return head.loss(v, batch)["loss"]
    
        f = hk.transform(run_tm_loss)
    
        n_res = consts.n_res
    
        representations = {
            "pair": 
                np.random.rand(n_res, n_res, consts.c_z).astype(np.float32),
        }
    
        batch = {
            "backbone_affine_tensor": random_affines_vector((n_res,)),
            "backbone_affine_mask": 
                np.random.randint(0, 2, (n_res,)).astype(np.float32),
            "resolution": np.array(1.).astype(np.float32),
        }
    
        value = {
            "structure_module": {
                "final_affines": random_affines_vector((n_res,)),
            }
        }
    
        params = compare_utils.fetch_alphafold_module_weights(
            "alphafold/alphafold_iteration/predicted_aligned_error_head"
        )

        out_gt = f.apply(params, None, representations, batch, value)
        out_gt = torch.tensor(np.array(out_gt.block_until_ready()))
    
        to_tensor = lambda n: torch.tensor(n).cuda()
        representations = tree_map(to_tensor, representations, np.ndarray)
        batch = tree_map(to_tensor, batch, np.ndarray)
        value = tree_map(to_tensor, value, np.ndarray)
    
        batch["backbone_affine_tensor"] = (
            affine_vector_to_4x4(batch["backbone_affine_tensor"])
        )
        value["structure_module"]["final_affines"] = (
            affine_vector_to_4x4(value["structure_module"]["final_affines"])
        )
   
        model = compare_utils.get_global_pretrained_openfold()
        logits = model.aux_heads.tm(representations["pair"])
       
        out_repro = tm_loss(
            logits=logits,
            final_affine_tensor=value["structure_module"]["final_affines"],
            **{**batch, **c_tm},
        )
        out_repro = out_repro.cpu()
    
        self.assertTrue(torch.max(torch.abs(out_gt - out_repro)) < consts.eps)


if __name__ == "__main__":
    unittest.main()
