Which of these properties does NOT characterize a feedforward neural network?

Question

BlackTom AI · Accepted Answer

Feedforward neural networks propagate information in a forward, acyclic manner through one or more layers; they can be shallow (one hidden layer) or deep (multiple hidden layers).

1) Relevant knowledge points and concepts
- Feedforward architecture: neurons are organized in input, hidden, and output layers with connections only from earlier to later layers (no cycles or feedback).
- Nonlinear activation functions: hidden-layer nonlinearities (e.g., ReLU, sigmoid, tanh) enable networks to approximate complex, non-linear mappings.
- Learning/optimization: hidden units have weights that are adjusted (via gradient descent/backpropagation) to minimize loss and improve predictive accuracy.
- Depth vs. shallow: “depth” refers to number of hidden layers; feedforward networks include both single-hidden-layer (shallow) and multi-hidden-layer (deep) models (e.g., multilayer perceptrons, deep feedforward nets).

2) Step-by-step reasoning
- Examine each option against the definition of feedforward networks.
  a) “The neuron’s activation function (in the hidden layer) is nonlinear.” — True: without nonlinearity, stacked linear layers collapse to a single linear transform, so nonlinearity is a defining practical property.
  b) “Hidden nodes optimize the weights on features (characteristics) to increase accuracy.” — True: training adjusts hidden-layer weights to extract useful feature combinations for accuracy.
  c) “Information moves in only one direction (input nodes -> output nodes).” — True: that is the hallmark of feedforward (no recurrent/feedback connections).
  d) “The network is only ‘shallow’ (one hidden layer) and cannot be ‘deep.’” — This is false: feedforward architectures can have many hidden layers; deep feedforward networks are common.

3) Calculations/intermediate steps
- No numerical calculation required; logical elimination based on definitions suffices.

4) Why the correct answer is correct
- The false statement is (d) because feedforward networks are not restricted to a single hidden layer; allowing multiple hidden layers yields deep feedforward networks used throughout deep learning.

5) Why the other options are incorrect choices
- Options a–c describe true characteristics of feedforward networks, so they cannot be the answer to “which does NOT characterize…”.

6) Conclusion
- Therefore, the property that does NOT characterize a feedforward neural network is: "The network is only “shallow” (one hidden layer) and cannot be “deep.”" This matches the provided answer.

Which of these properties does NOT characterize a feedforward neural network?单项选择题

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