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author | MathieuCarriere <mathieu.carriere3@gmail.com> | 2022-05-18 09:09:12 +0200 |
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committer | MathieuCarriere <mathieu.carriere3@gmail.com> | 2022-05-18 09:09:12 +0200 |
commit | 4dd9bc67a87415cef901926172f5374522daf61d (patch) | |
tree | 8210a7eb4a6ea0561896f67680b4fa5c949df3ce /src/python/gudhi | |
parent | 9422b2bf82624d1b5e982fe12e202e14d24256f7 (diff) | |
parent | c7afe82e863eb91d122d34f1d34255c04e27b51f (diff) |
Merge branch 'master' of https://github.com/GUDHI/gudhi-devel into diff
Diffstat (limited to 'src/python/gudhi')
-rw-r--r-- | src/python/gudhi/__init__.py.in | 4 | ||||
-rw-r--r-- | src/python/gudhi/persistence_graphical_tools.py | 25 | ||||
-rw-r--r-- | src/python/gudhi/simplex_tree.pyx | 15 |
3 files changed, 21 insertions, 23 deletions
diff --git a/src/python/gudhi/__init__.py.in b/src/python/gudhi/__init__.py.in index 3043201a..79e12fbc 100644 --- a/src/python/gudhi/__init__.py.in +++ b/src/python/gudhi/__init__.py.in @@ -23,10 +23,6 @@ __all__ = [@GUDHI_PYTHON_MODULES@ @GUDHI_PYTHON_MODULES_EXTRA@] __available_modules = '' __missing_modules = '' -# For unitary tests purpose -# could use "if 'collapse_edges' in gudhi.__all__" when collapse edges will have a python module -__GUDHI_USE_EIGEN3 = @GUDHI_USE_EIGEN3@ - # Try to import * from gudhi.__module_name for default modules. # Extra modules require an explicit import by the user (mostly because of # unusual dependencies, but also to avoid cluttering namespace gudhi and diff --git a/src/python/gudhi/persistence_graphical_tools.py b/src/python/gudhi/persistence_graphical_tools.py index 604018d1..7ed11360 100644 --- a/src/python/gudhi/persistence_graphical_tools.py +++ b/src/python/gudhi/persistence_graphical_tools.py @@ -193,6 +193,7 @@ def plot_persistence_barcode( x=[birth for (dim,(birth,death)) in persistence] y=[(death - birth) if death != float("inf") else (infinity - birth) for (dim,(birth,death)) in persistence] c=[colormap[dim] for (dim,(birth,death)) in persistence] + axes.barh(list(reversed(range(len(x)))), y, height=0.8, left=x, alpha=alpha, color=c, linewidth=0) if legend: @@ -324,6 +325,7 @@ def plot_persistence_diagram( x=[birth for (dim,(birth,death)) in persistence] y=[death if death != float("inf") else infinity for (dim,(birth,death)) in persistence] c=[colormap[dim] for (dim,(birth,death)) in persistence] + axes.scatter(x,y,alpha=alpha,color=c) if float("inf") in (death for (dim,(birth,death)) in persistence): # infinity line and text @@ -449,16 +451,15 @@ def plot_persistence_density( _, axes = plt.subplots(1, 1) try: - if len(persistence) > 0: - # if not read from file but given by an argument - persistence = _array_handler(persistence) - persistence_dim = np.array( - [ - (dim_interval[1][0], dim_interval[1][1]) - for dim_interval in persistence - if (dim_interval[0] == dimension) or (dimension is None) - ] - ) + # if not read from file but given by an argument + persistence = _array_handler(persistence) + persistence_dim = np.array( + [ + (dim_interval[1][0], dim_interval[1][1]) + for dim_interval in persistence + if (dim_interval[0] == dimension) or (dimension is None) + ] + ) persistence_dim = persistence_dim[np.isfinite(persistence_dim[:, 1])] persistence_dim = np.array( _limit_to_max_intervals( @@ -482,6 +483,7 @@ def plot_persistence_density( zi = k(np.vstack([xi.flatten(), yi.flatten()])) # Make the plot img = axes.pcolormesh(xi, yi, zi.reshape(xi.shape), cmap=cmap, shading="auto") + plot_success = True # IndexError on empty diagrams, ValueError on only inf death values except (IndexError, ValueError): @@ -489,6 +491,7 @@ def plot_persistence_density( birth_max = 1.0 death_min = 0.0 death_max = 1.0 + plot_success = False pass # line display of equation : birth = death @@ -504,7 +507,7 @@ def plot_persistence_density( ) ) - if legend: + if plot_success and legend: plt.colorbar(img, ax=axes) axes.set_xlabel("Birth", fontsize=fontsize) diff --git a/src/python/gudhi/simplex_tree.pyx b/src/python/gudhi/simplex_tree.pyx index a4914184..2c53a872 100644 --- a/src/python/gudhi/simplex_tree.pyx +++ b/src/python/gudhi/simplex_tree.pyx @@ -676,18 +676,17 @@ cdef class SimplexTree: return (normal0, normals, infinite0, infinites) def collapse_edges(self, nb_iterations = 1): - """Assuming the simplex tree is a 1-skeleton graph, this method collapse edges (simplices of higher dimension - are ignored) and resets the simplex tree from the remaining edges. - A good candidate is to build a simplex tree on top of a :class:`~gudhi.RipsComplex` of dimension 1 before - collapsing edges + """Assuming the complex is a graph (simplices of higher dimension are ignored), this method implicitly + interprets it as the 1-skeleton of a flag complex, and replaces it with another (smaller) graph whose + expansion has the same persistent homology, using a technique known as edge collapses + (see :cite:`edgecollapsearxiv`). + + A natural application is to get a simplex tree of dimension 1 from :class:`~gudhi.RipsComplex`, + then collapse edges, perform :meth:`expansion()` and finally compute persistence (cf. :download:`rips_complex_edge_collapse_example.py <../example/rips_complex_edge_collapse_example.py>`). - For implementation details, please refer to :cite:`edgecollapsesocg2020`. :param nb_iterations: The number of edge collapse iterations to perform. Default is 1. :type nb_iterations: int - - :note: collapse_edges method requires `Eigen <installation.html#eigen>`_ >= 3.1.0 and an exception is thrown - if this method is not available. """ # Backup old pointer cdef Simplex_tree_interface_full_featured* ptr = self.get_ptr() |