refactor _repr_latex functionality

pymc3/distributions/discrete.py

@@ -17,7 +17,6 @@
 from scipy import stats
 import warnings
 
-from pymc3.util import get_variable_name
 from .dist_math import bound, factln, binomln, betaln, logpow, random_choice
 from .distribution import Discrete, draw_values, generate_samples
 from .shape_utils import broadcast_distribution_samples
@@ -123,15 +122,6 @@ def logp(self, value):
             0 <= value, value <= n,
             0 <= p, p <= 1)
 
-    def _repr_latex_(self, name=None, dist=None):
-        if dist is None:
-            dist = self
-        n = dist.n
-        p = dist.p
-        name = r'\text{%s}' % name
-        return r'${} \sim \text{{Binomial}}(\mathit{{n}}={},~\mathit{{p}}={})$'.format(name,
-                                                get_variable_name(n),
-                                                get_variable_name(p))
 
 class BetaBinomial(Discrete):
     R"""
@@ -259,16 +249,6 @@ def logp(self, value):
                      value >= 0, value <= self.n,
                      alpha > 0, beta > 0)
 
-    def _repr_latex_(self, name=None, dist=None):
-        if dist is None:
-            dist = self
-        alpha = dist.alpha
-        beta = dist.beta
-        name = r'\text{%s}' % name
-        return r'${} \sim \text{{BetaBinomial}}(\mathit{{alpha}}={},~\mathit{{beta}}={})$'.format(name,
-                                                get_variable_name(alpha),
-                                                get_variable_name(beta))
-
 
 class Bernoulli(Discrete):
     R"""Bernoulli log-likelihood
@@ -371,13 +351,8 @@ def logp(self, value):
                 value >= 0, value <= 1,
                 p >= 0, p <= 1)
 
-    def _repr_latex_(self, name=None, dist=None):
-        if dist is None:
-            dist = self
-        p = dist.p
-        name = r'\text{%s}' % name
-        return r'${} \sim \text{{Bernoulli}}(\mathit{{p}}={})$'.format(name,
-                                                get_variable_name(p))
+    def _distr_parameters_for_repr(self):
+        return ["p"]
 
 
 class DiscreteWeibull(Discrete):
@@ -486,16 +461,6 @@ def random(self, point=None, size=None):
                                 dist_shape=self.shape,
                                 size=size)
 
-    def _repr_latex_(self, name=None, dist=None):
-        if dist is None:
-            dist = self
-        q = dist.q
-        beta = dist.beta
-        name = r'\text{%s}' % name
-        return r'${} \sim \text{{DiscreteWeibull}}(\mathit{{q}}={},~\mathit{{beta}}={})$'.format(name,
-                                                get_variable_name(q),
-                                                get_variable_name(beta))
-
 
 class Poisson(Discrete):
     R"""
@@ -590,14 +555,6 @@ def logp(self, value):
         return tt.switch(tt.eq(mu, 0) * tt.eq(value, 0),
                          0, log_prob)
 
-    def _repr_latex_(self, name=None, dist=None):
-        if dist is None:
-            dist = self
-        mu = dist.mu
-        name = r'\text{%s}' % name
-        return r'${} \sim \text{{Poisson}}(\mathit{{mu}}={})$'.format(name,
-                                                get_variable_name(mu))
-
 
 class NegativeBinomial(Discrete):
     R"""
@@ -717,16 +674,6 @@ def logp(self, value):
                          Poisson.dist(self.mu).logp(value),
                          negbinom)
 
-    def _repr_latex_(self, name=None, dist=None):
-        if dist is None:
-            dist = self
-        mu = dist.mu
-        alpha = dist.alpha
-        name = r'\text{%s}' % name
-        return r'${} \sim \text{{NegativeBinomial}}(\mathit{{mu}}={},~\mathit{{alpha}}={})$'.format(name,
-                                                get_variable_name(mu),
-                                                get_variable_name(alpha))
-
 
 class Geometric(Discrete):
     R"""
@@ -810,14 +757,6 @@ def logp(self, value):
         return bound(tt.log(p) + logpow(1 - p, value - 1),
                      0 <= p, p <= 1, value >= 1)
 
-    def _repr_latex_(self, name=None, dist=None):
-        if dist is None:
-            dist = self
-        p = dist.p
-        name = r'\text{%s}' % name
-        return r'${} \sim \text{{Geometric}}(\mathit{{p}}={})$'.format(name,
-                                                get_variable_name(p))
-
 
 class DiscreteUniform(Discrete):
     R"""
@@ -913,16 +852,6 @@ def logp(self, value):
         return bound(-tt.log(upper - lower + 1),
                      lower <= value, value <= upper)
 
-    def _repr_latex_(self, name=None, dist=None):
-        if dist is None:
-            dist = self
-        lower = dist.lower
-        upper = dist.upper
-        name = r'\text{%s}' % name
-        return r'${} \sim \text{{DiscreteUniform}}(\mathit{{lower}}={},~\mathit{{upper}}={})$'.format(name,
-                                                get_variable_name(lower),
-                                                get_variable_name(upper))
-
 
 class Categorical(Discrete):
     R"""
@@ -1044,14 +973,6 @@ def logp(self, value):
         return bound(a, value >= 0, value <= (k - 1),
                      tt.all(p_ >= 0, axis=-1), tt.all(p <= 1, axis=-1))
 
-    def _repr_latex_(self, name=None, dist=None):
-        if dist is None:
-            dist = self
-        p = dist.p
-        name = r'\text{%s}' % name
-        return r'${} \sim \text{{Categorical}}(\mathit{{p}}={})$'.format(name,
-                                                get_variable_name(p))
-
 
 class Constant(Discrete):
     r"""
@@ -1112,12 +1033,6 @@ def logp(self, value):
         c = self.c
         return bound(0, tt.eq(value, c))
 
-    def _repr_latex_(self, name=None, dist=None):
-        if dist is None:
-            dist = self
-        name = r'\text{%s}' % name
-        return r'${} \sim \text{{Constant}}()$'.format(name)
-
 
 ConstantDist = Constant
 
@@ -1231,16 +1146,6 @@ def logp(self, value):
             0 <= psi, psi <= 1,
             0 <= theta)
 
-    def _repr_latex_(self, name=None, dist=None):
-        if dist is None:
-            dist = self
-        theta = dist.theta
-        psi = dist.psi
-        name = r'\text{%s}' % name
-        return r'${} \sim \text{{ZeroInflatedPoisson}}(\mathit{{theta}}={},~\mathit{{psi}}={})$'.format(name,
-                                                get_variable_name(theta),
-                                                get_variable_name(psi))
-
 
 class ZeroInflatedBinomial(Discrete):
     R"""
@@ -1354,22 +1259,6 @@ def logp(self, value):
             0 <= psi, psi <= 1,
             0 <= p, p <= 1)
 
-    def _repr_latex_(self, name=None, dist=None):
-        if dist is None:
-            dist = self
-        n = dist.n
-        p = dist.p
-        psi = dist.psi
-
-        name_n = get_variable_name(n)
-        name_p = get_variable_name(p)
-        name_psi = get_variable_name(psi)
-        name = r'\text{%s}' % name
-        return (r'${} \sim \text{{ZeroInflatedBinomial}}'
-                r'(\mathit{{n}}={},~\mathit{{p}}={},~'
-                r'\mathit{{psi}}={})$'
-                .format(name, name_n, name_p, name_psi))
-
 
 class ZeroInflatedNegativeBinomial(Discrete):
     R"""
@@ -1523,22 +1412,6 @@ def logp(self, value):
             0 <= psi, psi <= 1,
             mu > 0, alpha > 0)
 
-    def _repr_latex_(self, name=None, dist=None):
-        if dist is None:
-            dist = self
-        mu = dist.mu
-        alpha = dist.alpha
-        psi = dist.psi
-
-        name_mu = get_variable_name(mu)
-        name_alpha = get_variable_name(alpha)
-        name_psi = get_variable_name(psi)
-        name = r'\text{%s}' % name
-        return (r'${} \sim \text{{ZeroInflatedNegativeBinomial}}'
-                r'(\mathit{{mu}}={},~\mathit{{alpha}}={},~'
-                r'\mathit{{psi}}={})$'
-                .format(name, name_mu, name_alpha, name_psi))
-
 
 class OrderedLogistic(Categorical):
     R"""
@@ -1619,12 +1492,3 @@ def __init__(self, eta, cutpoints, *args, **kwargs):
         p = p_cum[..., 1:] - p_cum[..., :-1]
 
         super().__init__(p=p, *args, **kwargs)
-
-    def _repr_latex_(self, name=None, dist=None):
-        if dist is None:
-            dist = self
-        name_eta = get_variable_name(dist.eta)
-        name_cutpoints = get_variable_name(dist.cutpoints)
-        return (r'${} \sim \text{{OrderedLogistic}}'
-                r'(\mathit{{eta}}={}, \mathit{{cutpoints}}={}$'
-                .format(name, name_eta, name_cutpoints))

pymc3/distributions/distribution.py

@@ -15,13 +15,15 @@
 import numbers
 import contextvars
 import dill
+import inspect
 from typing import TYPE_CHECKING
 if TYPE_CHECKING:
     from typing import Optional, Callable
 
 import numpy as np
 import theano.tensor as tt
 from theano import function
+from ..util import get_repr_for_variable
 import theano
 from ..memoize import memoize
 from ..model import (
@@ -135,9 +137,46 @@ def getattr_value(self, val):
 
         return val
 
-    def _repr_latex_(self, name=None, dist=None):
+    def _distr_parameters_for_repr(self):
+        """Return the names of the parameters for this distribution (e.g. "mu"
+        and "sigma" for Normal). Used in generating string (and LaTeX etc.)
+        representations of Distribution objects. By default based on inspection
+        of __init__, but can be overwritten if necessary (e.g. to avoid including
+        "sd" and "tau").
+        """
+        return inspect.getfullargspec(self.__init__).args[1:]
+
+    def _distr_name_for_repr(self):
+        return self.__class__.__name__
+
+    def _str_repr(self, name=None, dist=None, formatting='plain'):
+        """Generate string representation for this distribution, optionally
+        including LaTeX markup (formatting='latex').
+        """
+        if dist is None:
+            dist = self
+        if name is None:
+            name = '[unnamed]'
+
+        param_names = self._distr_parameters_for_repr()
+        param_values = [get_repr_for_variable(getattr(dist, x), formatting=formatting)
+            for x in param_names]
+
+        if formatting == "latex":
+            param_string = ",~".join([r"\mathit{{{name}}}={value}".format(name=name,
+                value=value) for name, value in zip(param_names, param_values)])
+            return r"$\text{{{var_name}}} \sim \text{{{distr_name}}}({params})$".format(var_name=name,
+                distr_name=dist._distr_name_for_repr(), params=param_string)
+        else:
+            # 'plain' is default option
+            param_string = ", ".join(["{name}={value}".format(name=name,
+                value=value) for name, value in zip(param_names, param_values)])
+            return "{var_name} ~ {distr_name}({params})".format(var_name=name,
+                distr_name=dist._distr_name_for_repr(), params=param_string)
+
+    def _repr_latex_(self, **kwargs):
         """Magic method name for IPython to use for LaTeX formatting."""
-        return None
+        return self._str_repr(formatting="latex", **kwargs)
 
     def logp_nojac(self, *args, **kwargs):
         """Return the logp, but do not include a jacobian term for transforms.
@@ -200,6 +239,9 @@ def logp(self, x):
         """
         return tt.zeros_like(x)
 
+    def _distr_parameters_for_repr(self):
+        return []
+
 
 class Discrete(Distribution):
     """Base class for discrete distributions"""
@@ -501,6 +543,9 @@ def random(self, point=None, size=None, **kwargs):
                 "Define a custom random method and pass it as kwarg random"
             )
 
+    def _distr_parameters_for_repr(self):
+        return []
+
 
 class _DrawValuesContext(metaclass=ContextMeta, context_class='_DrawValuesContext'):
     """ A context manager class used while drawing values with draw_values

pymc3/distributions/mixture.py

@@ -18,7 +18,6 @@
 import theano.tensor as tt
 import warnings
 
-from pymc3.util import get_variable_name
 from ..math import logsumexp
 from .dist_math import bound, random_choice
 from .distribution import (Discrete, Distribution, draw_values,
@@ -578,6 +577,8 @@ def random(self, point=None, size=None):
             samples = np.reshape(samples, size + dist_shape)
         return samples
 
+    def _distr_parameters_for_repr(self):
+        return []
 
 class NormalMixture(Mixture):
     R"""
@@ -627,14 +628,5 @@ def __init__(self, w, mu, sigma=None, tau=None, sd=None, comp_shape=(), *args, *
         super().__init__(w, Normal.dist(mu, sigma=sigma, shape=comp_shape),
                                             *args, **kwargs)
 
-    def _repr_latex_(self, name=None, dist=None):
-        if dist is None:
-            dist = self
-        mu = dist.mu
-        w = dist.w
-        sigma = dist.sigma
-        name = r'\text{%s}' % name
-        return r'${} \sim \text{{NormalMixture}}(\mathit{{w}}={},~\mathit{{mu}}={},~\mathit{{sigma}}={})$'.format(name,
-                                                get_variable_name(w),
-                                                get_variable_name(mu),
-                                                get_variable_name(sigma))
+    def _distr_parameters_for_repr(self):
+        return ["w", "mu", "sigma"]