class_docstr: Space of positive lower triangular matrices with unit-normed rows.
  
  Rows are unit normed wrt Euclidean norm.
  
  For more details, check section 7.4.1 of [T2022]_.
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docstr: Check if a point belongs to the unit normed plt matrices.
docstr_tok: ["Check","if","a","point","belongs","to","the","unit","normed","plt","matrices","."]
code: def belongs(self, point, atol=gs.atol):
      """Check if a point belongs to the unit normed plt matrices."""
      is_plt = self.embedding_space.belongs(point)
      is_unit_normed = self.image_space.belongs(
          self.diffeo.diffeomorphism(point),
      )
      return gs.logical_and(is_plt, is_unit_normed)
  
imports: import geomstats.backend
  from geomstats.geometry.base import DiffeomorphicManifold, VectorSpaceOpenSet
  from geomstats.geometry.diffeo import Diffeo
  from geomstats.geometry.invariant_metric import _InvariantMetricMatrix
  from geomstats.geometry.lie_group import MatrixLieGroup
  from geomstats.geometry.lower_triangular_matrices import LowerTriangularMatrices
  from geomstats.geometry.matrices import Matrices
  from geomstats.geometry.open_hemisphere import OpenHemisphere, OpenHemispheresProduct
  from geomstats.geometry.pullback_metric import PullbackDiffeoMetric
  from geomstats.geometry.riemannian_metric import RiemannianMetric
label_desc: Use image node_id 3 for calling the UnitNormedRowsPLTMatrices obj's underlying member method code with example usage: obj.belongs(point, atol) and returns: gs