PyTorch
API: torch.signbit
Strategy: Direct Mapping
JAX (Core)
API: jax.numpy.signbit
Strategy: Direct Mapping
NumPy
API: numpy.signbit
Strategy: Direct Mapping
Keras
API: keras.ops.signbit
Strategy: Macro '{input} < 0'
TensorFlow
API: tf.math.is_negative
Strategy: Direct Mapping
Apple MLX
API: —
Strategy: Macro '{input} < 0'
Flax NNX
API: jax.numpy.signbit
Strategy: Direct Mapping
PaxML / Praxis
API: jax.numpy.signbit
Strategy: Direct Mapping