Implemented icdf for distribution nodes.

modules/pytorch_wrapper/ptdm_icdf.py

@@ -0,0 +1,57 @@
+from typing import Any, Dict
+import torch
+from torch.distributions import *
+import ast
+
+class PtdmIcdf:
+    """
+    Computes the inverse of the cumulative distribution function for the input distribution.
+
+    **Note**  
+    Icdf is not supported for all distributions in PyTorch.
+
+    Args:
+            distribution (torch.distributions.distribution.Distribution): Distribution.
+            q (float): Value
+
+    category: PyTorch wrapper - Distribution
+    """
+
+    @classmethod
+    def INPUT_TYPES(cls) -> Dict[str, Any]:
+        """
+        Defines the input types for the function.
+
+        Returns:
+            Dict[str, Any]: A dictionary specifying the required input types.
+        """
+        return {
+            "required": {
+                "distribution": ("PTDISTRIBUTION", {}),
+                "q": ("STRING", {"default": ""})
+            }
+        }
+
+    RETURN_TYPES: tuple = ("TENSOR",)
+    FUNCTION: str = "f"
+    CATEGORY: str = "Distribution"
+
+    def f(self, distribution: torch.distributions.Distribution, q: str) -> tuple:
+        """
+        Computes the inverse of the cumulative distribution function for the input distribution.
+
+        Args:
+            distribution (torch.distributions.Distribution): Distribution.
+            q (str): Value
+
+        Returns:
+            tuple containing the probability
+        """
+        v2 = ast.literal_eval(q)
+        if isinstance(v2, int) is False and isinstance(v2, float) is False:
+            if isinstance(distribution, Dirichlet) is False:
+                raise ValueError("You need to specify a float or an int.")
+
+        tens = torch.tensor(v2, dtype=torch.float32)
+
+        return (distribution.icdf(tens),)