Expression(s) identifying input feature(s). Used as the column name and the dictionary key for feature parsing configs, feature tensors, and feature columns.

An integer vector that specifies the shape of the tensor. An integer can be given which means a single dimension tensor with given width. The tensor representing the column will have the shape of batch_size + shape.

A single value compatible with dtype or an iterable of values compatible with dtype which the column takes on during parsing if data is missing. A default value of NULL will cause tf$parse_example to fail if an example does not contain this column. If a single value is provided, the same value will be applied as the default value for every item. If an iterable of values is provided, the shape of the default_value should be equal to the given shape.

The types for values contained in the column. The default value is tf$float32. Must be a non-quantized, real integer or floating point type.

If not NULL, a function that can be used to normalize the value of the tensor after default_value is applied for parsing. Normalizer function takes the input Tensor as its argument, and returns the output tensor. (e.g. function(x) {(x - 3.0) / 4.2)}. Please note that even though the most common use case of this function is normalization, it can be used for any kind of Tensorflow transformations.