61 lines
2.1 KiB
Python
61 lines
2.1 KiB
Python
from typing import Any, Dict
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import ast
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import torch
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from torch.distributions import Categorical
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class PtdCategorical:
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"""
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Instantiates a Categorical distribution object from the input probabilities or logits. You have to specify one of them and not both.
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Args:
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probs (str): Probabilities of the distsribution. You can specify a scalar or a tuple of float.
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logits (str): Logits of the distribution. You can specify a scalar or a tuple of float.
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category: PyTorch wrapper - Distribution
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"""
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@classmethod
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def INPUT_TYPES(cls) -> Dict[str, Any]:
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"""
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Defines the input types for the function.
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Returns:
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Dict[str, Any]: A dictionary specifying the required input types.
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"""
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return {
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"required": {
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"probs": ("STRING", {"default": ""}),
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"logits": ("STRING", {"default": ""})
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}
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}
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RETURN_TYPES: tuple = ("PTDISTRIBUTION",)
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FUNCTION: str = "f"
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CATEGORY: str = "Distribution"
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def f(self, probs: str, logits: str) -> tuple:
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"""
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Instantiates a Categorical distribution object from the input probabilities or logits. You have to specify one of them and not both.
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Args:
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probs (str): Probabilities of the distsribution. You can specify a scalar or a tuple of float.
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logits (str): Logits of the distribution. You can specify a scalar or a tuple of float.
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Returns:
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tuple: (torch.distributions.binomial.Categorical)
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"""
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p = ast.literal_eval(probs) if probs else None
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l = ast.literal_eval(logits) if logits else None
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if p is not None and l is not None: # You cannot use if p because p or l can be "0".
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raise ValueError("You can specify either probabilities or logits, but not both.")
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if p is None and l is None:
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raise ValueError("You have to specify either probabilities or logits")
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if p is not None:
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dist = Categorical(probs=torch.tensor(p))
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elif l is not None:
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dist = Categorical(logits=torch.tensor(l))
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return (dist,)
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